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Question

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



Your Answer
A

5 D

Your Answer
B

2 D

Correct Answer
C

3 D

Your Answer
D

1 D


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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