Find the power of a concave lens of focal length 2.5 cm
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2/5 diopter p- 1/focal length
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The focal lengyh for concave lens is in negative.
F= -2.5cm = -2.5÷100m = - 1÷40m
Power=1÷f(in metre)
= - 1/1/40
= -40 D
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