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Grade 12th passModern Physics

(a)A diffraction grating used at normal incidence gives a yellow line (6000Ǻ) in a certain spectral
order superimposed on a blue line (4800Ǻ) of next higher order. If the angle of diffraction is sin-1
(4/3),
calculate the grating element

Profile image of Shreya Maheshwari
4 Years agoGrade 12th pass
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2 Answers

Profile image of ABD
4 Years ago
Dispersion is the phenomenon where the white light is separated into different colors of light according to the wavelength. Usually, the color with less wavelength will disperse the most and the color with highest wavelength will disperse the least.
Profile image of ABD
4 Years ago
We have sin30°=nN5750×10^-10..... (1)
Sin30°=nN4600×0^-10.....(2)
Equating we get n=4
Substitute values of n in equation (1)
We get N=217,391 lines per meter.
For finding spacing between lines
d=1/N
d=4.60 meter

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