Question

what is the power of concave lens of focal length 40cm

Answer 1

2.5diopter ...... .. .... ...

Answer 2

Answer:

The correct answer is -2.5 D.

Explanation:

Given:

Focal length = 40 cm

To find:

Power of concave lens =?

Concave lens is defined as the lens that diverges the light rays and it is termed as diverging lens.

Formula:

To find the power of concave lens

P = 1/f in centimeter (cm)

Here, f is 40 cm

P =1/ 40

P= 1(0.4)

Here we take the focal length as negative in a concave lens.

P = -2.5 D

D is Diopter.

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