What will be effect on diffraction pattern of grating if i) the number of lines in grating is increased. ii) grating element is of the order of a wavelength or less iii) if the rulings are

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written 7.9 years ago by

neeta.vanage • 880

modified 3.9 years ago by

pedsangini276 • 4.8k

Subject: Applied Physics 2

Topic: Interference And Diffraction Of Light

Difficulty: High

engineering physics

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2.9kviews

written 7.8 years ago by

neeta.vanage • 880

i) with the increase in number of lines the secondary maxima relative to the principal maxima decreases and becomes negligible. The principal maxima become more sharp and intense.

ii) we know (a+b) sinθ = nλ

For the first order minima ,Sinθ =λ/(a+b)

If a+b = λ, then

Sinθ = 1 …

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