Question

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${\huge{\rm{\underline{\underline{Question}}}}}$

Find the focal length of a lens of power - 2.0 D. What type of lens is this?
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Answer 1

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focal length is negative, the lens is a concave lens.

Answer 2

Answer:

Given, lens of power P = (−2.0)D

Power, P = 1/f

f = 1/p

therefore,

f = 1/-2.0

f = -0.5 m

Since focal length is negative, it is concave lens.

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