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Question

A combination of two lenses with power 1D and 2D is there what is the total power


A

5 D

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B

2 D

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C

3 D

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D

1 D

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Solution

The correct option is C

3 D


If two thin lenses of power p1 and p2 are held in contact then the power of the combination will be

p = p1 +p2

p = 1D + 2D

p = 3D


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