(A person uses a concave lens with a focal length of 20 cm as spectacles. What is the power of the lens?) *
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(A person uses a concave lens with a focal length of 20 cm as spectacles. What is the power of
(A person uses a concave lens with a focal length of 20 cm as spectacles. What is the power of the lens?) *
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Answer:
similarly the power of a concave lens of focal length 20 cm is 5.0 dioptre.
Verified answer
Answer:
Power of Lens = 1/f
where f is the focal length in metres.
f = 20 cm = 0.2 m
Power P = 1/f = 1/0.2 = 10/2 = 5 D
But since this is a concave lens, it's focal length will be negative, and hence the power will also be negative.
P = (-) 5 D
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