Abstract
Abstract This chapter examines a particular case of multiple-beam interference: where light is bounced repeatedly between two highly reflecting mirrors. It is assumed that the reader has already encountered interference ‘by division of amplitude’ in its two-beam case, as happens when light is reflected from opposite faces of a slab or traces the two paths through a Michelson interferometer. It is further assumed that the following are familiar: The optical path difference is n 2d cos θ when a light beam divides at the surfaces (separation d) of a slab of refractive index n, and travels inside the slab at angle θ to the normal.
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