Intensity Profiles for Newton's Rings
Newton's rings appear as a series of alternating bright and dark rings when monochromatic light is incident on a spherical lens in contact with a flat surface.[more]
The intensity variation in the interference pattern for Newton's rings for transmitted light is given by the equation . The intensity of the rings for reflected light is given by the equation , since there is a phase change of after reflection.
Here is the wavelength of light, is the radius of the Newton's rings and is the radius of curvature of the plano-convex lens.[less]
 K. D. Möller, Optics: Learning by Computing with Examples Using MathCAD, New York: Springer, 2003.
 A. N. Mateev, Optics, Moscow: Mir Publishers, 1988.