Question

Power of the lens is -40, its focal length is -​

Answer 1

Explanation:

power = 1/focal length

focal length = 1/-40 = - 0.025 m or -2.5cm

Answer 2

Solution

Power of lens (P)= 1/ focal length(f) in metre

f= 1/P

= 1/40 = 0.025 m or 2.5 cm

- sign represent that it is concave lens

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