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What is persistance of vision?...

What is persistance of vision?

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Answer the following questions : What is the persistence of vision ? Give one example of persistence of vision .

lntext Question. What examples in day to day life can you think about persistence of vision?

Answer the following questions : How is the phenomenon of persistance of vision used in motion pictures ?

Answer the following questions : Name any two applications based on persistence of vision .

Answer the following questions : Name two devices whose working is based on the phenomenon of persistance of vision .

State whether the following statements are true or false : ( If a statement is false , correct it and rewrite it.) : In television , we see a continous picture due to persistence of vision.

What is mosaic vision? Describe.

Answer the following questions : What is meant by the minimum distance of distinct vision ?

The least distance of distinct vision for a young adult with normal vision is about :

Fill in the blanks : The minimum distance of distinct vision for a normal human eye is………….

CHETANA PUBLICATION-LENSES-Exercise
  1. How is myopia corrected?

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  2. By which lens the matchstick can catch fire in the sunlight?

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  3. What is persistance of vision?

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  4. What is principal focus?

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  5. Concave lens:Negative focal length:: Convex lens:.

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  6. For the normal human eye, the distance of distinct vision is

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  7. What do you mean by power of accommodation?

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  8. Why do we have bring a small object near the eyes in order to see it c...

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  9. An object is placed at a distance of 15 cm from a convex lens.If the f...

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  10. An object is placed at a distance of 10cm from a convex lens of focal ...

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  11. An object is kept 60 cm from a lens gives a virtual image 20 cm in fro...

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  12. An object 6 cm tall is placed in front of a convex lens at a distance ...

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  13. An object is placed vertically at a distance of 20 cm from a convex le...

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  14. 5 cm high object is placed at a distance of 25 cm from a converging l...

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  15. The focal length of a convex lens is 20 cm.What is the power?

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  16. Doctor has prescribed a lens having power +1.5D. What will be the foca...

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  17. Calculate the focal length of a corrective lens having power+2.5D.

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  18. Three lenses having power 2, 2.5 and 1.7 D are kept touching in a row....

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  19. Define the following: Centre of curvature (C)

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  20. Define the following: Radii of curvature (R)

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