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Q.

The focal length of the lens in a photographic camera is 5 cm. What is the power of the lens?


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a

+15 D

b

+20 D

c

+25 D

d

None of these 

answer is B.

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Detailed Solution

The power of the lens is 20 D.
Given data in the problem,
The focal length of the camera, f=5 cm
           =0.05 m
The formula for the power of the lens is
Power, P = 1f, Where f is in meters.
⇒P=10.05 ⇒P=+20 D  
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