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 step by step, we will analyze the intensity at a point where the waves from two sources superimpose with different phase differences. The two sources have intensities \( I_1 = I \) and \( I_2 = 4I \).

### Step 1: Understanding the formula for resultant intensity
The resultant intensity \( I_R \) when two waves interfere can be given by the formula:
\[ I_R = I_1 + I_2 + 2 \sqrt{I_1 I_2} \cos \phi \]
where \( \phi \) is the phase difference between the two waves.
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