Physics, asked by debasak23, 1 year ago

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

Answers

Answered by mgiribabu1

7

Power of lens = 1/f

Convex lens: P1=1/0.4=+2.5D

Concave length: P2=1/(-0.25) = -4D

The power of combination,P = P1+P2 = 2.5-4= -1.5D

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