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Ankit developed an eye defect at the age...

Ankit developed an eye defect at the age of 65 yrs and had to wear a lens of power+3D.Answer the following questions:
(a) Name the eye defect.
(b) State two reasons why this defect is caused?
(c) Compute the focal length of his lens

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CHETANA PUBLICATION-LENSES-Exercise
  1. Selwyn is 16 yr old and wears a spectacle having a power of +2 D .Answ...

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  2. Vijay is 16 yr old and wears a spectacle having a power of -2 D .Answe...

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  3. Ankit developed an eye defect at the age of 65 yrs and had to wear a l...

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  4. What changes in the position of the candle should be made to obtain a ...

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  5. What is nature of image formed if a concave lens is used instead of a ...

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  6. State any one point of difference between a real and virtual image.

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  7. Label A and B in the diagram.

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  8. Explain the functions of A.

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  9. Name the two lenses A and B

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  10. Farsightedness can be corrected by using lens. A. Convex B. concave ...

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  11. The perception of dim light is concerned with cells. A. rod B. cone ...

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  12. Find the odd word out: Long-sightedness, myopia, short sightedness, ne...

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  13. Object at 2F1: image at 2F2:: object at F1:.

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  14. State whether the following statement are 'True' of False". If false w...

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

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  16. Give scientific reasons: We cannot clearly see an object kept at a...

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  17. Distinguish between : Farsightedness and Nearsightedness

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  18. Draw a neat and labelled diagram of human eye.

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  19. 5 cm high object is placed at a distance of 25 cm from a converging l...

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  20. Draw a neat and labelled diagram of Following: When object is beyond...

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