Question

the power of the lens is -4.0 D. what is the nature of this lens

Answer 1

The nature of this lens is concave.

Explanation:

It is given that,

Power of the lens is -4 D.

We know that the power of a lens is defined as the reciprocal of focal length.

Focal length, $f=\dfrac{1}{P}$

$f=\dfrac{1}{-4}$

f = -0.25 cm

We know that the focal length of the concave lens is negative. So, the nature of this lens is concave.

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