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Q.

A convex lens of focal length 0.5 m and concave lens of focal length 1 m are combined. The power of the resulting lens will be

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a

– 1 D

b

0.5 D

c

– 0.5 D

d

 1 D

answer is A.

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Detailed Solution

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P=P1+P2=1f1+1f2=1(0.5)+1(βˆ’1)=1D

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A convex lens of focal length 0.5 m and concave lens of focal length 1 m are combined. The power of the resulting lens will be