A person having myopic eyes uses a concave lens of focal length 50 cm. What is the power of the lens?

+ 0.02 D

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- 0.02 D

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- 2 D

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+ 2 D

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Solution

The correct option is C
- 2 D

A myopic eyes uses a convace lens, hence its power will be negative as the focal length is negative.

f = -50 cm = -0.5 m

P = 1 / f (in m)

= 1 /-0.5

= -2 D

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A person having myopic eyes uses a concave lens of focal length 50 cm. What is the power of the lens?

The correct option is C - 2 D A myopic eyes uses a convace lens, hence its power will be negative as the focal length is negative. f = -50 cm = -0.5 m P = 1 / f (in m) = 1 /-0.5 = -2 D

The correct option is C
- 2 D

A myopic eyes uses a convace lens, hence its power will be negative as the focal length is negative.

f = -50 cm = -0.5 m

P = 1 / f (in m)

= 1 /-0.5

= -2 D