power of a lens, having focal length 50cm, will be:
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= 100/50 = 2 dioptre. The SI unit of power is dioptre.
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The power of the lens is always given as the reciprocal of focal length. For the focal length of 50 cm, the power is given as
Power = 1/focal length = 1/(50 x 10-2)m
= 100/50 = 2 dioptre.
The SI unit of power is dioptre.
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