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Question

A converging lens has a focal length of 50cm. The power of the lens is

A
+5D
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B
+2D
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C
+0.5D
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D
0.5D
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Solution

The correct option is B +2D
The power of lens is P=1/f and the unit of it Dioptres (D). Here the focal length f should be in meter.
Here, f=50cm=(50/100)m=0.5m
So, P=+2D

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