In Young's double slit experiment using monochromatic light of wavelength λ, the intensity of light at a point on the screen where path difference is λ, is 'T' units. What is the intensity of light at a point where path difference is $\frac{λ}{4}$?

Zero 3T $\frac{r}{3}$ $\frac{r}{2}$

$\frac{r}{2}$

The correct answer is Option (4) → $\frac{r}{2}$