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Diffraction for JEE: 30 solved questions

Real JEE paper questions on diffraction, part of wave optics. Each opens with the options, the correct answer and a step-by-step solution. Papers run from 2005 to 2026. No sign-in needed to read them.

What this topic asks

• Single slit diffraction — 26 questions
• Resolving power and limits of ray optics — 4 questions

All 30 questions with solutions

• A single slit of width a is illuminated by a monochromatic light of wavelength 600 nm. The value of a for whi… JEE Main 15th April 1st Shift 2023
• Consider the diffraction pattern obtained from the sunlight incident on a pinhole of diameter 0.1 μm. If the… JEE Main 25th Feb 2nd Shift 2021
• In a double-slit experiment, green light (5303 Å) falls on a double slit having a separation of 19.44 μm and… JEE Main 11th Jan 2nd Shift 2019
• Two slits are 1 mm apart and the screen is located 1 m away from the slits. A light of wavelength 500 nm is u… JEE Main 8th April 2nd Shift 2024
• A slit of width a is illuminated by light of wavelength λ. The linear separation between 1^st and 3^rd minima… JEE Main 4th April 1st Shift 2026
• A monochromatic light of wavelength 6000 Å is incident on the single slit of width 0.01 mm. If the diffractio… JEE Main 1st Feb 1st Shift 2024
• A microwave of wavelength 2.0 cm falls normally on a slit of width 4.0 cm. The angular spread of the central… JEE Main 1st Feb 2nd Shift 2024
• The diffraction pattern of a light of wavelength 400 nm diffracting from a slit of width 0.2 mm is focused on… JEE Main 30th Jan 1st Shift 2024
• Visible light of wavelength 6000×10⁻⁸ cm falls normally on a single slit and produces a diffraction pattern.… JEE Main 7th Jan 1st Shift 2020
• The angular width of the central maximum in a single slit diffraction pattern is 60°. The width of the slit i… JEE Main 2018
• Light of wavelength 550 nm falls normally on a slit of width 22.0×10⁻⁵ cm. The angular position of the second… JEE Main Online 2018
• A single slit of width b is illuminated by a coherent monochromatic light of wavelength λ. If the second and… JEE Main Online 2017
• A single slit of width 0.1 mm is illuminated by a parallel beam of light of wavelength 6000 Å and diffraction… JEE Main Online 2017
• The box of a pin hole camera, of length L, has a hole of radius a. It is assumed that when the hole is illumi… JEE Main 2016
• In an experiment of single slit diffraction pattern, first minimum for red light coincides with first maximum… JEE Main Online 2014
• The first diffraction minimum due to the single slit diffraction is seen at θ = 30° for a light of wavelength… JEE Main Online 2012
• If I₀ is the intensity of the principal maximum in the single slit diffraction pattern, then what will be its… JEE Main 2005
• In single slit diffraction pattern, the wavelength of light used is 628 nm and slit width is 0.2 mm, the angu… JEE Main 2nd April 1st Shift 2026
• If the measured angular separation between the second minimum to the left of the central maximum and the thir… JEE Main 2nd April 1st Shift 2025
• In a Young's double slit experiment, two slits are located 1.5 mm apart. The distance of screen from slits is… JEE Main 4th April 2nd Shift 2025
• In a single slit experiment, a parallel beam of green light of wavelength 550 nm passes through a slit of wid… JEE Main 5th April 2nd Shift 2024
• A parallel beam of monochromatic light of wavelength 600 nm passes through single slit of 0.4 mm width. Angul… JEE Main 8th April 1st Shift 2024
• A parallel beam of monochromatic light of wavelength 5000 Å is incident normally on a single narrow slit of w… JEE Main 27th Jan 2nd Shift 2024
• In a single slit diffraction pattern, a light of wavelength 6000 Å is used. The distance between the first an… JEE Main 29th Jan 2nd Shift 2024
• Sodium light of wavelengths 650 nm and 655 nm is used to study diffraction at a single slit of aperture 0.5 m… JEE Main 24th June 1st Shift 2022
• Orange light of wavelength 6000×10⁻¹⁰ m illuminates a single slit of width 0.6×10⁻⁴ m. The maximum possible n… JEE Main 4th Sept 2nd Shift 2020
• A telescope with objective diameter R is used to observe a distant star emitting light of wavelength 500 nm,… JEE Main 4th April 1st Shift 2026
• Some distant star is to be observed by some telescope of diameter of objective lens a, at an angular resoluti… JEE Main 8th April 2nd Shift 2026
• In Young's double slit experiment, the distance between slits and the screen is 1.0 m and monochromatic light… JEE Main Online 2016
• In free space, an electromagnetic wave of 3 GHz frequency strikes over the edge of an object of size λ/(100),… JEE Main 26th June 1st Shift 2022