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An argon laser that has a wavelength of 455 nm shines on a double-slit apparatus, which...

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Physics

An argon laser that has a wavelength of 455 nm shines on adouble-slit apparatus, which produces an interference pattern on ascreen that is 10.0 m away from the slits. The slit separationdistance is 70.0 μm. (a) How many bright fringes are there on thescreen within an angle of ±1° relative to the central axis? (b) Howmany dark fringes are there on the screen within an angle of ±2°relative to the central axis? Be careful to count all thefringes.

answer: a) 5 b)8, please explain how to get these correctanswers.

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