Question:
Find the focal length of a lens of power - 2.0 D. What type of lens is this?
Answer:
We know, P =1/f
Where p = -2.0 D
or, -2 = 1/f
or, f = -1/2 m
f = -1/2 X 100 cm = -50 cm = -0.50 cm
The lens is a concave lens
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