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Q.

Two convex lenses of powers 4 D and 5 D are separated by a distance of 1/6 m. The power of the optical system so formed is

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a

-6 D

b

+6 D

c

10 D

d

2 D

answer is B.

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Detailed Solution

1F=1f1+1f2−df1f2P=P1+P2−dP1P2=4+6−16×4×6=6D
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