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What is diffraction grating?

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Diffraction grating

Diffraction grating is an extremely useful device. In one of its form it consists of a very large number of narrow slits side by side. The slits are separated by opaque spaces.

Diffraction gratings are of two types; transmission grating and reflection grating.
  1. Transmission grating: When a wavefront is incident on a grating surface light is transmitted through the slits and obstructed by the opaque portion. Such a grating is called a transmission grating.
  2. Reflection grating: When the lines of grating surface are drawn on a slivered surface then light is reflected from the position of the mirror in between any two lines. Such surfaces act as reflection gratings.
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