Q 12-10-062JEE MainJEE Main 2024 (27 Jan, Shift 2)Easy
A parallel beam of monochromatic light of wavelength $5000\ \text{Å}$ is incident normally on a single narrow slit of width $0.001\ \text{mm}$. The light is focused by a convex lens on a screen placed in its focal plane. The first minima will be formed for the angle of diffraction of ______ (degree).
Numerical value type. Enter your answer.
Answer: 30
First minimum: $a\sin\theta = \lambda$
$$\sin\theta = \frac{5\times10^{-7}}{1\times10^{-6}} = \frac12 \;\Rightarrow\; \theta = 30^\circ$$
Solution by Sreeraj P, M.Sc Physics