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A person needs a lens of power $- 4 D$ to correct his distant vision. What is the focal length of the lens required for correcting distant vision?

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- 0.25 cm

- 25 m

- 25 cm

+ 0.25 m

answer is C.

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Detailed Solution

The focal length of the lens required for correcting distant vision is

- 25 cm

.
Given,
Power,

P = - 4 D

.
It is known that the power of a lens is the reciprocal of the focal length of the lens. Mathematically,

P = \frac{100}{f}

Where

f

is the focal length of the lens in centimetres.
On substituting the values, we get the focal length as

\Rightarrow - 4 = \frac{100}{f}

\Rightarrow f = - 25 cm

Hence, the focal length of the lens required is

- 25 cm

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