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

P = -2.0 D

f = 1/P

f = 1/-2

f = -1/2

=> f = -0.5 m

=> So, the focal length is 0.5 metres.

=> As the focal length for this lens is negative, so it is a convex lens.

Answer 2

Answer:

Given,the lens of power P=(−2.0)D

Power, P=  1/f

               = 1/-2

            P = -0.5

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