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INTRODUCTION AND ELEMENTARY THEORY
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absorption achromatic amplitude analyser angle of incidence aperture aperture stop astigmatism beam centre collimated colour components conjugate corresponding crystal curvature diffraction direction dispersion distance disturbances effect emergent employed entrance pupil equal equation etalon exit pupil eyepiece field of view film flux focal length focal plane focus frequency Fresnel fringes geometrical given gives glass grating illumination image plane incident light indicated interference interferometer Kerr cell lens lenses luminous intensity magnification maxima maximum measured medium method microscope mirror monochromatic normal observed optic axis optical path optical system parallel paraxial path difference perpendicular phase difference plane of incidence plane polarized plane wave plate point source polarized light position principal planes prism pupil reflected refractive index region rotation screen seen shown in Fig slit source Snell's law spectrum spherical aberration superposed telescope theory thickness thin thin lens vector velocity wavefront wavelengths wedge white light zero zones