Physics, asked by HrishikeshChavan, 1 year ago

A lens has -4D power. Is the lens concave or convex .what is its focal length?

Answers

Answered by sanjanasadhwani

8

the minus sign tells that the lens is concave..
focal length--
p=1/f
f=1/p
f=1/-4
f=-0.25 cm

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