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The relationship between the angle of diffraction of violet, θv, and the angle of diffraction for red, θr, for a grating, is ________

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The relationship between the angle of diffraction of violet, θv, and the angle of diffraction for red, θr, for a grating, is ________

(a) θv > θr

(b) θv < θr

(c) θv = θr

(d) No relationship

This question was posed to me in a national level competition.

The origin of the question is Difference Between Prism and Grating Spectra in chapter Diffraction of Engineering Physics II

1 Answer

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Right option is (b) θv < θr

Easy explanation: For a diffraction grating, the angle of diffraction for violet is less than the one for red. However, with a prism, the angle of deviation for the violet rays of light is more than for the red rays of light.

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