Red light of wavelength 625 {\nm} is incident normally on an optical diffraction grating with 2 \times 10^5 lines \/ {\m}. Including central principal maxima, how many maxima may be observed on a screen which is far from the grating?

KCET 2010 Physics Solved Paper

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Red light of wavelength 625‌nm is incident normally on an optical diffraction grating with 2×105 lines ∕m. Including central principal maxima, how many maxima may be observed on a screen which is far from the grating?

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