Physics, asked by alok50, 1 year ago

(24). what is the power of a concave lens of focal length 20 cm

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Answered by VarshaD

1

f=-20
P=1/f
P=1/(-20)
P=-0.05.

alok50: this is wrong answer bro. .answer is -5

talented1: this is wrong the power of that lens will be -5 dioptre

Answered by talented1

1

power is - 100/20dioptre i.e. -5 dioptre

alok50: how

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