cse • paper_1 • waves_oscillationscse-1987-subject-02-008
Monochromatic light — UPSC CSE 1987 Physics PYQ
Buy PYQ Solution Manual →Monochromatic light of wavelength 6.56 \times 10^{-7}\text{ m} falls normally on a grating 2.00\text{ cm} wide. The first order spectrum is produced at an angle of 18^\circ15' from the normal. Deduce the total number of lines in the grating.
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