Question

A Convex Lens of focal length 25 cm and concave lens of focal length 10 cm are placed close contact with each other.Calculate Power of Combination

Answer 1

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convex f1 = 25cm = 0.25m

concave f2 =10cm =0.1 m

P1=1/f1

= 1 / 0.25

= 4D

P2 = 1 / f2

 = 1 / 0.1

= 10 D

p1 + p2 = power combination

4 + 10 = 14

therefore power combination is 14 diapter

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HOPE IT HELPED