Fresnel distance, Diffraction through circular slit, concept of Airy Disc, Rayleigh Criterion of Resolution, Fraunhofer diffraction PYQs: JEE Mains Physics

Showing 1–4 of 4 questions

1. 1. Given below are two statements :
   Statement-I : A plane wave after passing through prism remains as plane wave but passing through small pin hole may become spherical wave.
   Statement-II : The curvature of a spherical wave emerging from a slit will increase for increasing slit width.
   In the light of the above statements, choose the correct answer from the options given below. 2026 Hard
2. 2. Which of the following are true for a single slit diffraction?
   (A) Width of central maxima increases with increase in wavelength keeping slit width constant.
   (B) Width of central maxima increases with decrease in wavelength keeping slit width constant.
   (C) Width of central maxima increases with decrease in slit width at constant wavelength.
   (D) 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. 2026 Easy
3. 3. Consider the diffraction pattern obtained from the sunlight incident on a pinhole of diameter \(0.1\, \mu m\). If the diameter of the pinhole is slightly increased, it will affect the diffraction pattern such that : 2021 Hard
4. 4. The box of a pin hole camera, of length \(L\), has a hole of radius \(a\). It is assumed that when the hole is illuminated by a parallel beam of light of wavelength \(\lambda\), the spread of the spot (obtained on the opposite wall of the camera) is the sum of its geometrical spread and the spread due to diffraction. The spot would then have its minimum size ( say \(b_{min}\)) when 2016 Hard

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