Find the radius of curvature of the convex surface of a plano-convex lens, whose focal length is 0.3 m and the refractive index of the material of the lens is 1.5.

Explanation

For a planoconvex lens
`R_(1) =oo, R_(2)=?, f=0.3m, mu=1.5`
`(1)/(f)=(mu-1)((1)/(R_(1))-(1)/(R_(2)))`
`(1)/(0/3)=(1.5-1)((1)/(oo)-(1)/(R_(2)))`
`0.5(-(1)/(R_(2)))=(1)/(0.3)`
`-(0.5xx0.3)=R_(2)`
`rArr" "R_(2)=-0.15m`
`=-15cm`