Physics · 2026
JEE Main · 22 January 2026, Shift 2 · Q42
Which of the following are true for a single slit diffraction? A. Width of central maxima increases with increase in wavelength keeping slit width…
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.
Official answer
From NTA’s final answer key for this paper.
No correct option: NTA dropped this question in its final answer key.
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JEE Main 2026 Physics question, with the answer from NTA’s final answer key. Where our answers come from.