objective grating

objective grating

See objective prism.

objective grating

[äb′jek·tiv ′grād·iŋ]
(optics)
A series of equally spaced parallel wires placed over the objective lens of a telescope; photographic magnitudes of stars are calculated from the relative brightnesses of images in the resulting diffraction pattern.
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And if I add a spectrograph, an objective grating in front of my camera, I get a spectrum, and I can constrain the chemical composition of the object, and that tells us what it is made of."

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