Question

The power of concave lens having focal length 40 cm is equal to9​

Answer 1

Answer:

A convex lens of focal length 40 cm is in contact with a concave lens of focal length 25 cm. The power of the combination is. Solution : P=1f=1f1+1f2=10.4+1-0.25=-1.5diopter.

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Answer 2

answer:0.025

Explanation:

if power is 9then focal length is 40

then this is wrong.