What is the power (in diopters) of a converging lens with a focal length of 20cm? A diverging lens with a focal length of 30cm?
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Answer: As a converging lens keans a convex lens.
So P=1/f
=1/0.2m
=5D
A diverging lens means a concave lens focal length of it is always negative.
P=1/f
=1/(-0.3)
=(-3.3)D
Hope it helps!
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