Problem 15: An expanded beam of red light from a ruby laser (2 = 694.3 mm) is incident on a screen containing two very narrow horizontal slits separated by 0.200 mm. A fringe pattern appears on a white screen held 1.00 m away (consider that the angle is small). (a) How far (in rad and mm) above and below the central axis are the first zeros of irradiance? (b) How far (in mm) from the axis is the fifth bright band?
Problem 15: An expanded beam of red light from a ruby laser (2 = 694.3 mm) is incident on a screen containing two very narrow horizontal slits separated by 0.200 mm. A fringe pattern appears on a white screen held 1.00 m away (consider that the angle is small). (a) How far (in rad and mm) above and below the central axis are the first zeros of irradiance? (b) How far (in mm) from the axis is the fifth bright band?
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