Question
Which of the following are true for a single slit diffraction?
(A) Width of central maxima increases with increase in wavelength keeping slit width constant.
(B) Width of central maxima increases with decrease in wavelength keeping slit width constant.
(C) Width of central maxima increases with decrease in slit width at constant wavelength.
(D) Width of central maxima increases with increase in slit width at constant wavelength.
(E) Brightness of central maxima increases for decrease in wavelength at constant slit width.
Options
Solution
$\beta_{cm} = \frac{2\lambda D}{a}$
(A) Correct $\beta \propto \lambda$
(B) Incorrect
(C) Correct $\beta \propto \frac{1}{d}$
(D) Incorrect
(E) Correct
Statement A, C & E are correct. NTA Ans- 1 , Ans. (Bonus)
No option matching
Restored from a corrupted original and modified from an NTA-dropped question (JEE Main 2026, 22 Jan Shift-II); the correct combination (A, C, E) was not among the original options. Option A now states it and is keyed correct. Original NTA status: Dropped (no matching option).
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