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A red He-Ne laser with a wavelength of 632.8 nm illuminates two narrow horizontal slits with...

A red He-Ne laser with a wavelength of 632.8 nm illuminates two narrow horizontal slits with a
gap distance 0.200mm. A pattern of interference bands then appears on a screen 1.00m
from the columns.
a) How far from the central maximum, in both radians and millimeters on the screen, is first
minimum?
b) How far in millimeters on the screen, is the fifth maximum from the central maximum?
c) What is the intensity of the fifth maximum compared to the intensity of the central maximum if
the gap width is half the gap distance?

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