Question

what is the power of concave lens of focal length 50 cm
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Answer 1

Answer :-2 dioptres

Explanation:Hi,

Since it is a concave lens so the focal length of a concave lens is considered negative.

Thus,

Focal length f = -50 cm

                     begin mathsize 14px style equals negative 50 over 100 straight m equals negative 0.5 space straight m end style

Now,  

begin mathsize 14px style Power space straight P equals fraction numerator 1 over denominator straight f space left parenthesis in space metres right parenthesis end fraction straight P equals fraction numerator 1 over denominator negative 0.5 end fraction equals negative fraction numerator 1 cross times 10 over denominator 5 end fraction equals negative 2 space dioptres end style

Thus the power of the concave lens is -2 dioptres

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