Sahay Sir > Question Answers > NEET Last 32 Years Solved 1988 - 2019 Physics and Chemistry Video Solutions > Physics > Chapter 32 - Ray Optics > A plano-convex lens fits exactly into a plano-concave lens. Their plane surfaces are parallel to each other. If the lenses are made of different material of refractive indices μ1​ and μ2​ and R is the radius of curvature of the curved surface of the lenses, then focal length of the combination is

A plano-convex lens fits exactly into a plano-concave lens. Their plane surfaces are parallel to each other. If the lenses are made of different material of refractive indices μ1​ and μ2​ and R is the radius of curvature of the curved surface of the lenses, then focal length of the combination is

In total internal reflection when the angle of incidence is equal to the critical angle for the pair of medium in contact what will be angle of refraction?