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Q.

A symmetric double convex lens is cut in two equal parts along its diameter. If the power of the original lens was 4D, the power of a divided lens will be

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a

2 D

b

4 D

c

3 D

d

5 D

answer is C.

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Detailed Solution

When you cut the lens along its diameter its thickness does not change. So converging point of the lens does not change

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