Question

.Find the power of a concave lens of focal length 2 m
yrr koi clearly explain kr do​

Answer 1

answer

P=-0.5 dioptre

explanation

according to sign convecation system

focal length of concave lense is considered as negative so

f=-2m

and power is given by

P=1/f

so

P=1/-2

=-0.5dioptre

power of cancave lense always will be negative and power of convex lense always be positive