Question

The power of a lens i
s - 40, what is its focal length?​

Answer 1

Explanation:

#Given, P = - 40 D. f = -0.025 m. Thus, the focal length of the lens is -0.025 m.

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Answer 2

Answer:

    -2.5cm

Explanation:

power of lens is -40

Since power is negative its a concave lens

Power = 1 / focal length

-40 = 1 / focal length

focal length = 1 / -40

focal length = -0.025m = -2.5cm