The Radius of Curvature of both the surfaces of lens are equal If one of the surface is made - Physics - Ray Optics And Optical Instruments

Question

The Radius of Curvature of both the surfaces of lens are equal
If one of the surface is made plane by grinding how will the focal
length and power change?

Neha Gupta · Accepted Answer

Focal length with two surfaces is given by:1f = (n-1) 1R1-1R2When
one surface is made plane then radisu of curvature becomes
infinityand 1infinity = 0Therefore focal length decreases
Since power = 1/focal length
Since focal length dec, power increases

The Radius of Curvature of both the surfaces of lens are equal. If one of the surface is made plane by grinding how will the focal length and power change?