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Chapter Page VI Optical instruments 87 167
Chapter Page VIII Theories regarding the nature of light could
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achromatic achromatised adjusted amplitude aperture astigmatism axis binocular bright called centre chromatic aberration coincide collimator colours combination concave conjugate convergent convex lens cornea corresponding cross-wires crystalline lens curved determined deviation diameter diffraction displacement distance distant object electromagnetic equal equation eyelens eyepiece field-lens film focal length focal plane focal point focus focussed formula given glass plate goniometer Huygens illumination image formed incident ray instrument magnification measured medium method Michelson micrometer microscope minimum mounted nodal normal numerical aperture observed obtained optical bench optical system path pencil perpendicular placed polarisation position principal plane principal points prism produce radiation radius of curvature real image reflected reflexion refracting surface refractive index refractometer represented in Fig result retina rotation scale screen secondary seen shown in Fig situated slit speed spherical aberration spherical surface spherical wave telescope theory thin lens thin lenses tion velocity of light vibrations wave-length wavefront