## Geometrical optics |

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### Contents

CHAP PAGE | 1 |

Reflection of Rays from Point Sourcf | 13 |

Refraction of Rays from Point Sources | 28 |

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### Common terms and phrases

achromatic angles of incidence angular magnification aplanatic points applied astigmatic difference chapter co-ordinates coincide colours combination condition cone conjugate points conjugate rays consider convex lens corresponding curved cut the axis described deviation direction distant object entrance pupil equal equation exit pupil eye-piece Fermat's Principle figure 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 notation 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 spherical aberration spherical surface subtended suppose telescopic system thin lens unit plane wave