How would you produce coherent light from an ordinary incandescent light bulb? A. By using a spectral filter, telescope and spectral (color) filter respectively. B. C. D. By using a spectral (color) filter, spectral filter and a telescope respectively. By using a spectral filter, a pinhole and a spectral (color) filter respectively. By using a spatial filter, a pinhole and a spectral (color) filter respectively.
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