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IFoS · Paper I · Waves & Opticsifos-2017-subject-02-003

Plane transmission grating — UPSC Physics Optional IFoS 2017 Paper I

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A parallel beam of light of wavelength 5890~\text{\AA} is incident at an angle of 30^\circ on a plane transmission grating with 15000 lines/inch. Find the highest order of spectrum that can be observed.

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