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Q.

The power of a concave lens of focal length 50 cm is ____ D.


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Detailed Solution

The power of a concave lens of focal length 50 cm is -2 D.
Given,
From the sign convention,
Focal length of the concave lens, f= -50 cm
                                                          = -0.5 m
It is known that the power of a lens is the reciprocal of the focal length of the lens. Mathematically,
P=1f
Where f is the focal length of the lens.
Substituting the given values, we get the power of the lens as
⇒P=1(-0.5)
⇒P=-2 D
Hence, the power of the lens is -2 D.
 
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The power of a concave lens of focal length 50 cm is ____ D.