Electromagnetic Waves and Wave Optics: Diffraction — Wider Slit MCQ

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Diffraction — Wider SlitMediumQuestion 20251

Question

In single-slit diffraction, making the slit very wide (a >> λ) causes:

A
The central maximum to become very wide
B
Diffraction to disappear and a sharp geometric shadow to form
Correct
C
Maximum narrowing of fringes
D
More bright secondary maxima

Correct answer

Diffraction to disappear and a sharp geometric shadow to form

Explanation

When a >> λ, θ_min = λ/a → 0, so the central maximum narrows to essentially a geometric beam with sharp edges — diffraction is negligible. This is why large objects cast sharp shadows in ordinary light.

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