Discussion
Gratings, which are produced by photographic means using lasers are known as :
Answer: B
Gratings made photographically with lasers are holographic gratings.
A holographic grating is made by exposing a photoresist coating to the interference pattern of two laser beams, which forms a set of fine, perfectly regular lines. After development the pattern is coated with metal. Such gratings have very few periodic errors, so they produce far less stray light and fewer 'ghost' lines than ruled gratings, which is valuable in spectrophotometers.
Ruled gratings are cut mechanically with a diamond tool. Echelle gratings are coarse ruled gratings used at high orders, and Littrow and Ebert are names of monochromator mountings, not of a way of making gratings.
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