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Q.

What is the nature of the lens if its power is negative?

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a

Convex

b

Concave

c

Bifocal

d

None of these

answer is B.

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Detailed Solution

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

P = \frac{1}{f}

Where

f

is the focal length of the lens.
From the above relation, it can be said that the power is negative because the focal length is negative. Also, the concave lenses have a negative focal length. Hence, it can be said that the lens is concave as it has negative power.

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