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What is the focal point and the focal length?
The focal point is the point at which light rays parallel to the optical axis converge after passing through a lens or reflecting off a concave mirror. It is the point where the image of an object is formed. The focal length is the distance between the focal point and the optical center of the lens or mirror. It is a measure of how strongly the lens or mirror converges or diverges light. **
What is a virtual focal point and how is it formed?
A virtual focal point is a point in space where light rays appear to converge after being reflected or refracted by a lens or mirror. It is called "virtual" because the light rays do not actually converge at that point, but they appear to do so when traced back. A virtual focal point is formed when parallel light rays pass through a concave lens or are reflected by a convex mirror. The lens or mirror causes the light rays to diverge, and when traced back, they appear to converge at a point behind the lens or mirror, creating a virtual focal point. **
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Learning Resources Hot Dots Numberblocks 1–10 Activity Book & Interactive Pen, Over 75 Activities Included - Age 4+ - Educational Toy Learning ResourcesCount on Hot Dots to bring learning with the Numberblocks to life anywhere, anytime. The Hot Dots interactive way of learning encourages children to learn independently and at their own pace. Hot Dots is easy to use – review the question and touch the tip of the interactive Hot Dots pen to a dot for immediate feedback. Select the correct answer and the pen glows green. The pen glows red for the incorrect answer. Press the audio button to incorporate fun Numberblocks sounds into the learning. The special edition Numberblocks Hot Dots pen is chunky and easy for little hands to hold, and has a rubberised, textured grip. The durable, spiral bound Activity Book has over 100 activities featuring Numberblocks One to Ten and the Numberblobs. The content covers a range of early years maths activities including number recognition for 1–10, number order, matching, simple addition and subtraction, number bonds to 10, subitising, and problem-solving. Includes Numberblocks 1–10 Activity Book and interactive pen. Book measures 19cm L x 14cm W and pen measures 16cm L. After the learning fun is over, the book and interactive pen store inside the packaging which also has a convenient carrier handle. Pen requires 2 AAA batteries not included.24,99 £*Shipping: 2,99 £Secure redirect to the provider
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Learning Resources Hot Dots Numberblocks 11–20 Activity Book & Interactive Pen, Over 60 Activities Included - Age 5+ - Educational Toy Learning ResourcesCount on Hot Dots to bring learning with the Numberblocks to life anywhere, anytime. The Hot Dots interactive way of learning encourages children to learn independently and at their own pace. Hot Dots is easy to use – review the question and touch the tip of the interactive Hot Dots pen to a dot for immediate feedback. Select the correct answer and the pen glows green. The pen glows red for the incorrect answer. Press the audio button to incorporate fun Numberblocks sounds into the learning. The special edition Numberblocks Hot Dots pen is chunky and easy for little hands to hold, and has a rubberised, textured grip. The durable, spiral-bound Activity Book has over 100 activities featuring Numberblocks Eleven to Twenty. The content covers a range of early years maths activities including number recognition for 11–20, number order, matching, addition and subtraction, multiplication and division, comparing numbers, and problem-solving. Includes Numberblocks 11–20 Activity Book and interactive pen. Book measures 19cm L x 14cm W and the pen is 16cm L. After the learning fun is over, the book and interactive pen store inside the packaging which also has a convenient carrier handle. Pen requires 2 AAA batteries not included.26,99 £*Shipping: 2,99 £Secure redirect to the provider
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Learning Resources Lock & Key Clubhouse - Ages 18 Months+ - Educational Toy Learning ResourcesUnlock the doors to learning with the Lock & Key Clubhouse! This adorable fine motor skills toy builds co-ordination, hand strength and dexterity with every turn of the key! Discover 5 fun surprises behind the doors. Use the attached chunky key to unlock and open the doors, counting 1, 2, 3, 4, 5 as you go. Find the friendly birdie, fish, puppy, bunny and kitty. There’s a lot of learning packed into this playset. See the shapes above each door! There’s a circle, heart, triangle, square and star. Each also has a different colour and number. The peekaboo aspect of this toy helps children grasp the concept of object permanence, which is an essential early years cognitive milestone.22,99 £*Shipping: 2,99 £Secure redirect to the provider
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Numberblocks Numberblob Counters Set by Learning Resources - Ages 3 Years+ Learning ResourcesNUMBERBLOCKS AS SEEN ON TV: Bring the magic of on-screen maths learning with the Numberblocks TV series to life in the classroom with these Numberblocks Numberblob Counters VERSATILE TEACHING RESOURCE: Use these counters for teaching a range of essential early years maths skills including counting, sequencing, grouping, patterning, sorting, addition, subtraction, subitising, cardinality, and more MULTIPLE WAYS TO SORT: Numberblob Counters have open and closed mouth poses, and shapes on the bottom of the counters and are ideal for a variety of sorting activities FUN TO USE: These adorable Numberblob Counters are made from high-quality, soft, durable plastic that children will enjoy handling; counters are easy to wipe clean, and store neatly in the convenient storage tub with carry handle INCLUDES: 120 counters in fun Numberblocks unique colours – white, yellow, light orange, dark pink, red, turquoise, blue, purple, green, light grey, and dark grey, plus teacher-developed guide; counters measure 2cm in diameter14,99 £*Shipping: 2,99 £Secure redirect to the provider
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What is the difference between the focal point of a converging lens and the virtual focal point of a diverging lens?
The focal point of a converging lens is the point where parallel rays of light converge after passing through the lens. This focal point is real and can be located on the opposite side of the lens from the object. On the other hand, the virtual focal point of a diverging lens is the point from which the diverging rays of light appear to originate when extended backward. This virtual focal point is not a physical point where light actually converges but is a theoretical point used in ray diagrams to trace the path of light rays. **
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Which 50mm fixed focal length?
The 50mm fixed focal length lens is a popular choice among photographers for its versatility and ability to capture images with a natural perspective similar to the human eye. There are various 50mm lenses available from different camera manufacturers, such as Canon, Nikon, Sony, and Sigma, each offering unique features and image quality. It is important to consider factors like aperture size, build quality, and compatibility with your camera system when choosing the right 50mm lens for your photography needs. **
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What is a focal headache?
A focal headache is a type of headache that is localized to a specific area of the head. It typically occurs on one side of the head and can be described as a sharp, stabbing pain. Focal headaches can be caused by various factors such as tension, migraines, or cluster headaches. It is important to consult a healthcare professional for an accurate diagnosis and appropriate treatment. **
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What is the focal length 2?
The focal length 2 is a measurement that refers to the distance between the lens and the image sensor when the lens is focused at infinity. It is a key parameter in determining the field of view and magnification of a lens. A shorter focal length 2 results in a wider field of view and greater depth of field, while a longer focal length 2 provides a narrower field of view and higher magnification. **
Which focal length do I need?
The focal length you need depends on the type of photography you are interested in. For portraits and close-up shots, a focal length between 50mm to 85mm is ideal. For landscapes and architecture, a wider focal length such as 24mm to 35mm is recommended. If you are looking for a versatile option, a zoom lens with a focal length range of 24-70mm or 70-200mm can cover a wide range of shooting scenarios. Ultimately, it is important to consider your shooting style and preferences when choosing the right focal length for your needs. **
What focal length for Deep Sky?
For deep sky astrophotography, a focal length of around 400-800mm is generally recommended. This range allows you to capture detailed images of galaxies, nebulae, and star clusters while still maintaining a wide enough field of view to include surrounding stars and celestial objects. A longer focal length can help bring out more details in distant objects, but may also make framing and tracking more challenging. Ultimately, the best focal length will depend on the specific objects you want to capture and your equipment setup. **
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Focal-JMlab HikVision 4MP Exir Vari-Focal Dome Network Camera - Weatherproof, HD Video, H.265+, 2.8-12mm Lens, Used - Like NewStep into professional-grade surveillance with the HikVision 4MP EXIR Vari-Focal Dome Network Camera , a powerful CCTV solution engineered for high-performance security monitoring. Designed for both commercial and residential use, this advanced dome camera delivers crystal-clear HD video, intelligent compression, and flexible viewing angles—making it a reliable alternative to traditional CCTV systems. ✔️ 4MP HD Resolution – Capture sharp, detailed footage with high clarity for accurate monitoring and evidence ✔️ 2.8–12mm Motorized Varifocal Lens – Adjustable zoom and focus for flexible coverage, from wide-angle to detailed close-ups ✔️ EXIR Infrared Night Vision – Advanced IR technology for clear visibility even in complete darkness, with extended range ✔️ H.265+ Compression – Efficient video storage and bandwidth usage without compromising image quality ✔️ Wide Dynamic Range (WDR) – Balanced exposure in bright and dark areas for clear images in challenging lighting conditions ✔️ Weatherproof & Vandal-Resistant – IP67-rated for outdoor use and IK10-rated for impact protection ✔️ Smart Detection Features – Advanced analytics for motion detection and human/vehicle classification (select models) ✔️ Flexible Installation – Dome design with adjustable angles for ceiling or wall mounting ✔️ Local Storage Support – Compatible with microSD cards (up to 256GB) for onboard recording ✔️ Power Options – Supports PoE (Power over Ethernet) or 12V DC for simplified installation The HikVision 4MP EXIR Vari-Focal Dome Network Camera is built for users who need reliable, high-quality surveillance with advanced features and flexibility. Whether you're securing a shop, office, or home, this camera offers powerful performance, smart monitoring capabilities, and durable construction—ensuring peace of mind with professional-level security.167,99 £*Shipping: 0,00 £Secure redirect to the provider
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Learning Resources Sing-Along Numberblock Five Plush Interactive Toy, Counting Toy - Age 3+ Learning ResourcesGive a big hand for Sing-Along Numberblock Five, the interactive cuddly toy who’s a real star! This cuddly toy helps little ones build counting and colour recognition skills through imaginative play and interactive learning with the friendly Numberblock Five. Numberblock Five has her famous High Five Hand – just like in the episodes! See each finger light up and count along from 1–5. Numberblock Five is the lead singer in the band. Listen as she shares 12 phrases and songs including the Numberblocks theme tune. Numberblock Five measures approx. 28cm W x 27cm H. Requires 3 AAA batteries (included). Numberblocks Playful Pals One & Two and Three & Four are also available26,99 £*Shipping: 2,99 £Secure redirect to the provider
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Learning Resources Hot Dots Numberblocks 1–10 Activity Book & Interactive Pen, Over 75 Activities Included - Age 4+ - Educational Toy Learning ResourcesCount on Hot Dots to bring learning with the Numberblocks to life anywhere, anytime. The Hot Dots interactive way of learning encourages children to learn independently and at their own pace. Hot Dots is easy to use – review the question and touch the tip of the interactive Hot Dots pen to a dot for immediate feedback. Select the correct answer and the pen glows green. The pen glows red for the incorrect answer. Press the audio button to incorporate fun Numberblocks sounds into the learning. The special edition Numberblocks Hot Dots pen is chunky and easy for little hands to hold, and has a rubberised, textured grip. The durable, spiral bound Activity Book has over 100 activities featuring Numberblocks One to Ten and the Numberblobs. The content covers a range of early years maths activities including number recognition for 1–10, number order, matching, simple addition and subtraction, number bonds to 10, subitising, and problem-solving. Includes Numberblocks 1–10 Activity Book and interactive pen. Book measures 19cm L x 14cm W and pen measures 16cm L. After the learning fun is over, the book and interactive pen store inside the packaging which also has a convenient carrier handle. Pen requires 2 AAA batteries not included.24,99 £*Shipping: 2,99 £Secure redirect to the provider
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Learning Resources Hot Dots Numberblocks 11–20 Activity Book & Interactive Pen, Over 60 Activities Included - Age 5+ - Educational Toy Learning ResourcesCount on Hot Dots to bring learning with the Numberblocks to life anywhere, anytime. The Hot Dots interactive way of learning encourages children to learn independently and at their own pace. Hot Dots is easy to use – review the question and touch the tip of the interactive Hot Dots pen to a dot for immediate feedback. Select the correct answer and the pen glows green. The pen glows red for the incorrect answer. Press the audio button to incorporate fun Numberblocks sounds into the learning. The special edition Numberblocks Hot Dots pen is chunky and easy for little hands to hold, and has a rubberised, textured grip. The durable, spiral-bound Activity Book has over 100 activities featuring Numberblocks Eleven to Twenty. The content covers a range of early years maths activities including number recognition for 11–20, number order, matching, addition and subtraction, multiplication and division, comparing numbers, and problem-solving. Includes Numberblocks 11–20 Activity Book and interactive pen. Book measures 19cm L x 14cm W and the pen is 16cm L. After the learning fun is over, the book and interactive pen store inside the packaging which also has a convenient carrier handle. Pen requires 2 AAA batteries not included.26,99 £*Shipping: 2,99 £Secure redirect to the provider
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What is the focal point and the focal length?
The focal point is the point at which light rays parallel to the optical axis converge after passing through a lens or reflecting off a concave mirror. It is the point where the image of an object is formed. The focal length is the distance between the focal point and the optical center of the lens or mirror. It is a measure of how strongly the lens or mirror converges or diverges light. **
-
What is a virtual focal point and how is it formed?
A virtual focal point is a point in space where light rays appear to converge after being reflected or refracted by a lens or mirror. It is called "virtual" because the light rays do not actually converge at that point, but they appear to do so when traced back. A virtual focal point is formed when parallel light rays pass through a concave lens or are reflected by a convex mirror. The lens or mirror causes the light rays to diverge, and when traced back, they appear to converge at a point behind the lens or mirror, creating a virtual focal point. **
-
What is the difference between the focal point of a converging lens and the virtual focal point of a diverging lens?
The focal point of a converging lens is the point where parallel rays of light converge after passing through the lens. This focal point is real and can be located on the opposite side of the lens from the object. On the other hand, the virtual focal point of a diverging lens is the point from which the diverging rays of light appear to originate when extended backward. This virtual focal point is not a physical point where light actually converges but is a theoretical point used in ray diagrams to trace the path of light rays. **
-
Which 50mm fixed focal length?
The 50mm fixed focal length lens is a popular choice among photographers for its versatility and ability to capture images with a natural perspective similar to the human eye. There are various 50mm lenses available from different camera manufacturers, such as Canon, Nikon, Sony, and Sigma, each offering unique features and image quality. It is important to consider factors like aperture size, build quality, and compatibility with your camera system when choosing the right 50mm lens for your photography needs. **
Similar search terms for Focal
-
Learning Resources Lock & Key Clubhouse - Ages 18 Months+ - Educational Toy Learning ResourcesUnlock the doors to learning with the Lock & Key Clubhouse! This adorable fine motor skills toy builds co-ordination, hand strength and dexterity with every turn of the key! Discover 5 fun surprises behind the doors. Use the attached chunky key to unlock and open the doors, counting 1, 2, 3, 4, 5 as you go. Find the friendly birdie, fish, puppy, bunny and kitty. There’s a lot of learning packed into this playset. See the shapes above each door! There’s a circle, heart, triangle, square and star. Each also has a different colour and number. The peekaboo aspect of this toy helps children grasp the concept of object permanence, which is an essential early years cognitive milestone.22,99 £*Shipping: 2,99 £Secure redirect to the provider
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Numberblocks Numberblob Counters Set by Learning Resources - Ages 3 Years+ Learning ResourcesNUMBERBLOCKS AS SEEN ON TV: Bring the magic of on-screen maths learning with the Numberblocks TV series to life in the classroom with these Numberblocks Numberblob Counters VERSATILE TEACHING RESOURCE: Use these counters for teaching a range of essential early years maths skills including counting, sequencing, grouping, patterning, sorting, addition, subtraction, subitising, cardinality, and more MULTIPLE WAYS TO SORT: Numberblob Counters have open and closed mouth poses, and shapes on the bottom of the counters and are ideal for a variety of sorting activities FUN TO USE: These adorable Numberblob Counters are made from high-quality, soft, durable plastic that children will enjoy handling; counters are easy to wipe clean, and store neatly in the convenient storage tub with carry handle INCLUDES: 120 counters in fun Numberblocks unique colours – white, yellow, light orange, dark pink, red, turquoise, blue, purple, green, light grey, and dark grey, plus teacher-developed guide; counters measure 2cm in diameter14,99 £*Shipping: 2,99 £Secure redirect to the provider
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Numberblocks Counting Puzzle Set by Learning Resources - Ages 3 Years+ Learning ResourcesNUMBERBLOCKS AS SEEN ON TV: Learn to count from 1–20 with the friendly Numberblocks! These Numberblocks jigsaw puzzles are based on the friendly characters children know and love from the award-winning TV series. COUNT FROM 1–20: Make learning to count fun! As children complete the 20 counting puzzles, they’ll be counting the Numberblocks and Numberblobs, identifying each Numberblock’s Numberling, as well as building colour recognition and fine motor skills. MATCH NUMBERS & PICTURES: Match the Numberblock to its Numberling, and then see if you can match the puzzle piece with the correct number of Numberblobs to complete the puzzle. SELF-CORRECTING PUZZLES: Each of these clever self-correcting Numberblocks counting puzzles fits together in a unique way, so there’s only one right answer. INCLUDES: 20 x 3-piece puzzles. The chunky pieces are made from durable card and are easy for little hands to hold. Pieces store in the reusable packaging after play. Completed puzzles measure 15cm L x 10cm W.14,99 £*Shipping: 2,99 £Secure redirect to the provider
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Numberblocks Sequencing Puzzle by Learning Resources - Ages 3 Years+ - Educational Toy Learning ResourcesNUMBERBLOCKS AS SEEN ON TV: Help children learn to sequence the numbers 1–20 in the correct order with their friends Numberblocks One to Twenty from the hit TV series. LEARN TO COUNT 1–20: Make learning to count 1–20 in the correct order fun for young children! As children complete the 20 colourful puzzles, they’ll be building basic maths skills along with colour recognition and fine motor skills. MATCH NUMBERS & PICTURES: Start with the 1-5 Numberblocks sequencing puzzles – can you put your friends One, Two, Three, Four, and Five in the correct order? As children learn and grow, progress to the next puzzle. PERFECT FOR LEARNING: Each of these Numberblocks maths puzzles is colour-coded for easy set-up. Each puzzle also has a number line, a teaching tool to help children sequence numbers and use to solve simple maths problems. INCLUDES: 10 double-sided puzzles - 4 each of puzzles for 1–5 (13cm L x 15cm W) and 1–10 (26cm L x 15cm W) and 2 for numbers 1–20 (51cm L x 15cm W).11,99 £*Shipping: 2,99 £Secure redirect to the provider
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What is a focal headache?
A focal headache is a type of headache that is localized to a specific area of the head. It typically occurs on one side of the head and can be described as a sharp, stabbing pain. Focal headaches can be caused by various factors such as tension, migraines, or cluster headaches. It is important to consult a healthcare professional for an accurate diagnosis and appropriate treatment. **
-
What is the focal length 2?
The focal length 2 is a measurement that refers to the distance between the lens and the image sensor when the lens is focused at infinity. It is a key parameter in determining the field of view and magnification of a lens. A shorter focal length 2 results in a wider field of view and greater depth of field, while a longer focal length 2 provides a narrower field of view and higher magnification. **
-
Which focal length do I need?
The focal length you need depends on the type of photography you are interested in. For portraits and close-up shots, a focal length between 50mm to 85mm is ideal. For landscapes and architecture, a wider focal length such as 24mm to 35mm is recommended. If you are looking for a versatile option, a zoom lens with a focal length range of 24-70mm or 70-200mm can cover a wide range of shooting scenarios. Ultimately, it is important to consider your shooting style and preferences when choosing the right focal length for your needs. **
-
What focal length for Deep Sky?
For deep sky astrophotography, a focal length of around 400-800mm is generally recommended. This range allows you to capture detailed images of galaxies, nebulae, and star clusters while still maintaining a wide enough field of view to include surrounding stars and celestial objects. A longer focal length can help bring out more details in distant objects, but may also make framing and tracking more challenging. Ultimately, the best focal length will depend on the specific objects you want to capture and your equipment setup. **
* All prices are inclusive of VAT and, if applicable, plus shipping costs. The offer information is based on the details provided by the respective shop and is updated through automated processes. Real-time updates do not occur, so deviations can occur in individual cases. ** Note: Parts of this content were created by AI.