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Q.

A thin convex lens of focal length 10 cm is placed in contact with a concave lens of same material and of same focal length. The focal length of combination will be

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a

Zero

b

Infinity

c

10 cm

d

20 cm

answer is B.

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Detailed Solution

f=f1f2f1+f2=10(−10)10+(−10)=−10010−10=∞
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