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Diffraction grating — UPSC IFoS 2025 Physics PYQ
Buy PYQ Solution Manual →A parallel beam of sodium light of wavelength 5893\text{ \AA} is incident on a diffraction grating. The angle between the first order spectra on either side of the normal is 27^{\circ} 42'. Find :
(i) The number of rulings/mm on the grating.
(ii) The greatest number of bright images obtained.
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