Find the focal length of a lens of power -2.0 D. what type of lens is this
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Answered by
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It is concave lens of focal length -0.5m.
alapan4444:
but how to find it
Answered by
118
the power of this lens has a negative sign, so this is a concave lens .
Now,
power, P = 1/ f
-2 = 1/ f
f = -1 / 2 m
[converting m into cm]
f = -1 / 2 x 100
so, focal length of lens , f. = -50 cm.
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