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Q.

A convex lens of focal length 50 cm and a concave lens of focal length 100 cm are separated by a distance at 10 cm. what is the power of combination.

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a

1 D

b

1.2 D

c

1.7 D

d

2 D

answer is B.

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Detailed Solution

P=P1+P2 dP1P2P=10050+100−100−10×10−2×10050×100−100 P = 1.2 D
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