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angle of incidence angle of refraction aperture Astigmatism center of curvature centimeters Chromatic Aberration CONCAVE MIRROR Constant deviation prism converging lens CONVEX MIRROR critical angle denser medium density diopters direction of light diverging lens focal length focal point image distance Image Formation Image inverted incident ray index of refraction law of reflection length f lens equation lens surface light is refracted light passes light rays located magnification measured mi/sec Negative Lens normal object and image object distance object FIGURE optical glass optical instruments p q f parallel perpendicular phenomena Porro Prism positive lens principal axis principal focus principal points rarer medium rays of light rectilinear propagation reflected ray refracting angle Refracting Surface rotates SECTION shown in figure Snell's Law Spherical Aberration spherical lenses Spherical Mirrors theory Thick Lens thin lenses total deviation TOTAL REFLECTION velocity of light Vergence virtual image wave wave-front wavelengths