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Reflection of Rays from Point Sources
Refraction of Rays from Point Sources
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achromatic angles of incidence angular magnification aplanatic points astigmatic difference co-ordinates coincide colours combination condition cone conjugate points conjugate rays consider convex lens corresponding curved cut the axis described deviation distant object entrance pupil equal equation exit pupil eye-piece Fermat's Principle figure focal distance focal length focussed formula geometrical optics give rise image focal point image formed image principal image space incident ray inclination lenses lies light measured medium microscope negative numerical aperture object and image object focal point object glass object principal object space obtain optical instruments optical system origin pair of conjugate parallel rays paraxial perpendicular plane mirror positive principal focus principal points principal rays prism quantity radiation radius of curvature ratio reflection refracting surface refractive index relation sint spherical aberration spherical surface subtended suppose telescopic system thin lens unit plane wave