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Q.

Two lenses are placed in contact with each other and the focal length of combination is 80 cm. If the focal length of one is 20 cm, then the pow,er of the other will be

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a

1.66 D

b

4.00 D

c

-1.00 D

d

- 3.75 D

answer is D.

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Detailed Solution

1F−1f1+1f2⇒180=120+1f2⇒f2=−803 cm∴Power  of  second  lensP2=100f2=100−80/3=−3.75 D
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