Q 12-10-051JEE MainJEE Main 2024 (1 Feb, Shift 1)Easy
A monochromatic light of wavelength $6000\ \text{\AA}$ is incident on a single slit of width $0.01\ \text{mm}$. If the diffraction pattern is formed at the focus of a convex lens of focal length $20\ \text{cm}$, the linear width of the central maximum is
Answer: (B) $24\ \text{mm}$
$$w = \frac{2\lambda f}{a} = \frac{2\times6\times10^{-7}\times0.2}{1\times10^{-5}} = 2.4\times10^{-2}\ \text{m} = 24\ \text{mm}$$
Solution by Sreeraj P, M.Sc Physics