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Common terms and phrases
air film amplitude angle of incidence aperture blue bright band circle circular colour concave convergent convex cornea corresponding crystal curve d₁ determine deviation diffraction direction displacement distance divergent emitted equal equation ether EXPT extraordinary ray eye-piece F₁ film focal length fringes gives rise glass half-period elements illuminated image formed incident ray incident wave internally reflected lens lenses luminous medium mirror motion moving negative Nicol nodal point normal object obtained optic axis ordinary ordinary ray parallel particles passing path pencil perpendicular phase plane of incidence plate position principal focus principal plane principal point prism produced radius of curvature reflected ray reflected wave refractive index resultant retina right angles rotated screen second principal seen similar slit spectra spectrum spherical spherical aberration straight line telescope termed thickness tourmaline transmitted vibrations wave front wave plate wave surface wave-length wavelets