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Other Eyes Defects

A myopic pers...

Question

A myopic person can see things clearly if they lie between 8 cm and 100 cm from his eye. The lens will enable him to see the moon distinctly if its focal length is:

A

zero

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B

infinity

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C

+ 100 cm

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D

- 100 cm

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Solution

The correct option is D
- 100 cm

The final image of the moon should be formed at a distance of 100 cm. Using a concave lens of focal length 100 cm will enable him to see the moon distinctly.

Focal length of lens =-100 cm

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