Electromagnetic Waves and Wave Optics: Central Maximum Width MCQ

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Central Maximum WidthEasyQuestion 20219

Question

Width of the central maximum in single-slit diffraction increases when:

A
Slit width increases
B
Slit width decreases or wavelength increases
Correct
C
Screen moves closer
D
Wavelength decreases

Correct answer

Slit width decreases or wavelength increases

Explanation

Angular half-width of central max = λ/a. Narrower slit → larger diffraction → wider central maximum. This is why a pinhole gives a very spread diffraction pattern.

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