Single-Slit Diffraction Challenge
25 NEET-standard questions on diffraction at a single slit: central maximum, minima, secondary maxima, fringe widths, colour and wavelength, and how the pattern differs from Young’s fringes. Answer each one. If you get it wrong, Vidya Ma’am explains it with an animated movie you can control, a slider to play with, and a step-by-step solution. Then try again.
NCERT Physics XII Part II · Ch. 10 · pp. 266–268Keys: A–D or 1–4 to answer
🧠 Formula memory tricks (open before you start)
First minimuma sin θ = λ → θ ≈ λ/anth minimum: θ ≈ nλ/a, n = ±1, ±2, … (not 0)
Central width2λD/aTwice the width of every side band (λD/a)
Secondary maximaθ ≈ (n + ½)λ/aWeaker and weaker as n grows
Change a or λWider slit: narrower pattern. Longer λ: wider pattern.Red fringes are wider than blue
Young versus single slitYoung: equal fringes. Single slit: unequal, fading.Energy only moves, never lost
Fresnel distance (beyond NCERT)zF = a²/λz < zF: rays work. z > zF: diffraction
right first tryfixed after explanationstill to fix
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