A plano convex lens with a radius of curvature R is lying on

Last updated: 6/7/2023

A plano convex lens with a radius of curvature R is lying on a reflecting plane surface such that the convex part of the lens is in contact with the plane surface The lens is illuminated from above The shape of interference fringes is A circular B hyperbolic C elliptical D parabolic Fifty one tuning forks are arranged in order of increasing frequencies so that each fork gives 3 beats per second