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UPCET / UPSEE Diffraction — practice questions

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Diffraction questions and exercises with answers

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In a single-slit Fraunhofer diffraction pattern, the first minimum occurs at angle $\theta$ satisfying:Read the answer and worked solution →

Worked practice questions

In a single-slit Fraunhofer diffraction pattern, the first minimum occurs at angle $\theta$ satisfying:

  1. $a\sin\theta = \lambda/2$
  2. $a\sin\theta = \lambda$
  3. $a\sin\theta = 2\lambda$
  4. $a\sin\theta = n\lambda \cdot d/D$
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Correct answer: B. $a\sin\theta = \lambda$

**First minimum:** $a\sin\theta = \lambda$ (slit divided into 2 halves, paths from extremes differ by $\lambda$ — pairs cancel). Successive minima at $a\sin\theta = n\lambda$ (n = ±1, ±2, …) central maximum is twice as wide as side fringes.

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