Question

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

Answer 1

Here is your answer,

Power is the reciprocal of its focal length

P=1/f(in metre)

for concave lens power and focal length is negative .
P= -1/2
Power= -0.5Dioptre.

hope it helps.

Answer 2

Dear Student,

◆ Answer -

Power of concave lens = -0.5 D

● Explaination -

# Given -

focal length of concave lens = 2 m

# Solution -

Focal length of concave lens is taken negative. So f = -2 m.

Power of the lens is calculated as the reciprocal of focal length in metres.

P = 1 / f

P = 1 / -2

P = -0.5 D

Therefore, power of the concave lens is -0.5 D.

Thanks dear. Hope this help you...