Which of the following are true for a single slit diffracti…

Physics Wave Optics JEE Main 2026 MCQ (Single Correct)

Which of the following are true for a single slit diffraction?

Width of central maxima increases with increase in wavelength keeping slit width constant.

Width of central maxima increases with decrease in wavelength keeping slit width constant.

Width of central maxima increases with decrease in slit width at constant wavelength.
(E) only only

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.
only
only

Text Solution

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The correct answer is:

For single slit diffraction, linear width of central maximum is .

Width increases with wavelength (keeping constant) - TRUE since .
Width increases with decreasing wavelength - FALSE, opposite of A.
Width increases with decreasing slit width (keeping constant) - TRUE since .
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.