Question

What is the power of a concave lens of focal length 25 cm ?

Answer 1

Answer:

P= - 4.0 D

Explanation:

Since it is a concave lens, focal length is negative.

The focal length should be in metres when you are calculating power.

f= -25cm

= -25/100

= -0.25m

P=1/f

=1/-0.25

= - 4 D

So, the answer is

power= - 4.0 dioptre (D)

Hope it is clear...

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