Express the power of concave lens of focal length 20 cm with its sign. – InterviewSolution

1.

Express the power of concave lens of focal length 20 cm with its sign.

Answer»

f = - 20 cm = - 20/100 = -0.2 m ( Focal length of concave lens is negative)

P = 1/f (f in meter) = 1/ -0.2 = -5D

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