A convex  spherical refracting surfaces separates two media glass and air `(mu_g=1.5).
Channel: Doubtnut
Date: 05/07/2020

A convex  spherical refracting surfaces separates two media glass and air `(mu_g=1.5).` If the image is to be real, at what minimum distance u should the object be placed in air if R is the radius of curvature