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INTRODUCTION AND ELEMENTARY THEORY
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aberration amplitude angle aperture assumed axis beam becomes bright centre chromatic coherence colour complete components conjugate constant corresponding crystal depends determined difference diffraction direction discussion dispersion distance disturbances effect element emergent employed equal equation example eyepiece fact field focal length focus follows frequency fringes given gives glass grating Hence illumination incident increased indicated intensity interference known lens lenses light limit maxima maximum means measured medium method microscope mirror moves necessary normal object observed obtained optical parallel passes path pattern perpendicular phase placed plane plate polarized position possible principal prism produced pupil referred reflection refractive refractive index region represented resolving result rotation screen seen separation shown shows similar simple single slit space spectral spherical Suppose surface telescope theory thickness thin usually vibration wave wavefront wavelength zero