Saturday 16 March 2013

DIFFRACTION GRATING - Q2

2) What is a plane transmission diffraction grating?
Ans:
Diffraction by a plane transmission grating:

A beam of monochromatic light of wavelength λ is incident on a grating at angle α to the grating normal, and diffracted along several discrete paths {βm}, for diffraction orders {m}. The incident and diffracted rays lies on opposite sides of the grating. The configuration shown, in which the transmission grating is illuminated from the back, is most common.

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