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Q.

Two thin lenses, one of focal length + 60 cm and the other of focal length – 20 cm are put in contact. The combined focal length is

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a

+15cm

b

-15 cm

c

+30 cm

d

-30 cm

answer is D.

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Detailed Solution

1F=1f1+1f2=160+1(−20)⇒F=−30cm
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Two thin lenses, one of focal length + 60 cm and the other of focal length – 20 cm are put in contact. The combined focal length is