A lens is placed on a flat plate of glass to test whether its surface is spherical.
(a) Show that the radius rm of the m th dark ring should be

Where R is the radius of curvature of the lens surface facing the plate and the wavelength of the light used is l. Assume that rm (b) Are the dark fringes equally spaced? If not, do they get closer together or farther apart as you move out from the center?

Transcribed Image Text:

Incident light Glass Air Glass