What is the power of a lens of focal length 50 cm?
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Answer:
The power of a lens is 1/focal length (measured in meters). So, 50 cm is 1/2 meter, so the power is -2; D stands for diopters, the unit of power for lenses. Hence, the power of a concave lens of focal length 50 cm is -2D.
Explanation:
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HERE'S YOUR ANSWER
We know,
POWER is the reciprocal of focal length (in metres)
p=1/f
f=50 cm
=0.5 m
.: p=1/f
p= 1/0.5
= 2D (Here, D is dioptre- unit of power for lens)
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