When the diffraction pattern from a certain slit illuminated with laser light (lambda = 6330 angstrom) is projected on a screen 150cmfrom the slit, the second minima on each side are seperated by 8cm. This tells us that 1-the slit is approximately 0.005cm wide 2-the slit is approximately 0.05cm wide 3-a/lambda = 7.5 approx. 4-a/lamda= 750 where a is slit width

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Q. A Young's double slit apparatus has slits separated by 0.28 mm and a screen 48 cm away from the slits. The whole apparatus is immersed in water and the slits are illuminated by the red light (

λ = 700

nm in vacuum). Find the fringe-width of the pattern formed on the screen.

A young's double slit apparatus has slits separated by 0.28 mm and a screen 48 cm away from the slits. The whole apparatus is immersed in water and the slits are illuminated by the red light ( $λ = 700$ nm in vacuum) find th efringe-width of the pattern formed on the screen.

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