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Diffraction

Q1- A 1.0 cm wide diffraction grating has 1000 slits. It is illuminated by light of wavelength 550 nm. What are the angles of the first two diffraction maxima?

Q2- A helium-neon laser of wavelength 633 nm illuminates a diffraction grating. The distance between the two first order bright fringes is 32 cm on a screen 2.0 m behind the grating. What is the spacing between slits of the grating?

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