Question

Find the power of a concave lens of focal length 2 m.
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Answer 1

hey mate

Power(P) = 1/focal length(f)(in m) = 1/-2 = -0.5 D(dioptre)

Power of concave lens is negative.

Answer 2

$\huge \bold \blue{hey \: there}$

It is given that

Focal length of concave lens=2 m

We know that

Power=1/f(in metres)

Now, since a concave lens is a diverging lens, it's focal length will be negative.

Power=1/(-2)= -0.5 D

Answer: -0.5 dioptres