Two sources of intensity `I` and 4I are used in an interference experiment. Find the intensity at a point where the waves from two sources superimpose with a phase difference of (a) zero, (b) `pi//2`, (c ) `pi` and (d) ratio of maximum and minimum intensity.

Explanation

To solve the problem of finding the intensity at a point where the waves from two sources superimpose with different phase differences, we will use the formula for resultant intensity in interference:

\[ I_R = I_1 + I_2 + 2\sqrt{I_1 I_2} \cos(\phi) \]

Where:
- \(I_R\) is the resultant intensity,
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