Question: Two monochromatic point sources radiate in-phase. At the usual distant plane of observation (parallel to the line connecting the sources) the irradiance from one of

Two monochromatic point sources radiate in-phase. At the usual distant plane of observation (parallel to the line connecting the sources) the irradiance from one of them is 100 times the irradiance from the other. Show that in general the fringe pattern is such that

I_max = (√I₁ + √I₂)²
and
I_min = (√I₁ - √I₂)²

Draw a graph of the net irradiance versus distance from the central axis. What does the pattern actually look like? Determine the visibility.

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