Find the intensity of light at a point on the screen when two interfering waves of the same intensity \((I_0)\) have a path difference of
(i) \(\frac{\lambda}{4}\)
(ii) \(\frac{\lambda}{3}\)
Show Hint
For two coherent waves of equal intensity \(I_0\),
\[
I=4I_0\cos^2\left(\frac{\phi}{2}\right)
\]
and
\[
\phi=\frac{2\pi}{\lambda}\Delta x
\]
Always convert the given path difference into phase difference first, and then substitute into the intensity formula.