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angle aperture approximation back focal plane coherent collimated light color components constant correlation function corresponding cosine curve density determine developer diffraction pattern displaced distance equal equation exponential exposed exposure focal length focal point Fourier series Fourier transform frequency front focal plane gelatin given glass grams harmonic hologram holography illuminated incident light index of refraction integral interference pattern intersection laser lens lenses Let us consider light amplitude light beam light source maximum mirror monochromatic multiple negative Newton's rings obtain optical axis optical correlator optical data processing output path length phase term photographic film pinhole plane F plane wavefronts plane waves point source position power spectrum principal ray produce real image reference beam Ronchi ruling screen shown in Figure shows silver halide silver halide crystals sine sine-wave zone plate sinusoidal slits spatial spectral points spherical surface transmission function virtual image waveform wavefronts wavelength zero zone plate