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Red light (wavelength 632.8 nm in air) from a Helium-Neon laser is incident on a single...

Red light (wavelength 632.8 nm in air) from a Helium-Neon laser is incident on a single slit of width 0.05 mm. The entire apparatus is immersed in water of refractive index 1.333. Determine the angular width of the central peak.

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