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air film amplitude aperture atom beam bright calculate centre chromatic aberration collimator colour Completion Test Summary converging lens crown glass crystal curvature curve deviation diagram diameter diffraction dioptres distance distant object double slit effect electron emitted energy equal equation experiment eye lens eyepiece Figure film final image flint glass focal length focal plane focus formula Fraunhofer diffraction Fresnel diffraction fringes grating hence illuminated image formed intensity interface interference known lenses light incident Lloyd's mirror measured medium microscope mirror Newton's rings normal adjustment objective lens observer optic axis optical path parallel light paraxial rays path difference phase plate polarised position prism Problems based produced radiation radius reflection refractive index resolving power result retina rotation screen Section appear seen shown in fig shows spectrometer spectrum spherical aberration surface Test Summary Chapter theory thickness thin lens wave wavefront wavelength white light zeroth order maximum zone