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Photonics Dictionary

objective grating

A coarse diffraction grating that is used to form a scale of intensities to determine the relative magnitudes of stars. The grating is placed over the objective of a telescope to form a diffraction pattern of a star. This pattern, which consists of a series of images of the star that decrease in intensity, is recorded photographically and used as a scale in rating the undiffracted images of stars of lesser magnitude.

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