JEE Main 2026 — Wave Optics Question with Solution
JEE Main 2026 (22 January Shift 2)
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.
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.
Choose an option
Show full solutionCorrect option: A
Correct answer
AA, C, E only
Step-by-step explanation
For single slit diffraction, linear width of central maximum is .
A: Width increases with wavelength (keeping constant) - TRUE since .
B: Width increases with decreasing wavelength - FALSE, opposite of A.
C: Width increases with decreasing slit width (keeping constant) - TRUE since .
D: Width increases with increasing slit width - FALSE, opposite of C.
E: Brightness increases with decreasing wavelength at constant slit width - TRUE since less wavelength means less diffraction spreading and more concentrated intensity.
Statements A, C, and E are true.
A: Width increases with wavelength (keeping constant) - TRUE since .
B: Width increases with decreasing wavelength - FALSE, opposite of A.
C: Width increases with decreasing slit width (keeping constant) - TRUE since .
D: Width increases with increasing slit width - FALSE, opposite of C.
E: Brightness increases with decreasing wavelength at constant slit width - TRUE since less wavelength means less diffraction spreading and more concentrated intensity.
Statements A, C, and E are true.
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This is a previous-year question from JEE Main 2026, covering the Wave Optics chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.