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What is meant by power of …

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What is meant by power of a lens? Write it's SI unit.A student uses a lens of focal length 40 cm and another of -20 cm .Write the nature and power of each lens.

Posted by Bharat Choudhary 5 years, 8 months ago

CBSE > Class 10 > Science

1 answers

Avni Gupta 5 years, 8 months ago

Power of a lens is defined as the ability of the lens to converge the rays of light falling on it. Its SI unit is Dioptre (D) Lens A Focal length (f)= 40 P=1/f (in metres) =1/0.4 = +2.5 D Lens B Focal length (f)=-20 P=1/f(in m) =1/-0.2 =-5 D

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CBSE > Class 10 > Science