Physics - Wave Optics
Practise 24 WBJEE previous year questions on Wave Optics, compiled from papers spanning 2009 to 2026. Each question is pulled directly from the actual exam paper it appeared in, so you're practising in the exact style and difficulty WBJEE tests.
Wave Optics has been asked in 16 of the 18 years of WBJEE papers analysed (2009–2026), with 24 questions in all. 58% of them were easy, 42% moderate and 0% tough. Most of its questions came from 2026, with 2 questions that year. In the last three years (2024–2026) it had 5 questions across 3 papers, about 1.7 per paper.
The chapter's 3 topics are not weighted equally: Youngs Double Slit Experiment (13 questions, 54%), Interference of Light (6 questions, 25%), and Diffraction of Light (5 questions, 21%) have been asked the most. Youngs Double Slit Experiment has also led over the last five years, with 3 questions.
- 1Up to what distance, the ray optics is sufficiently valid when the aperture is mm wide and the wavelength is Å?2026Diffraction of Light
- 2Two points of monochromatic and coherent sources of light of wavelength each, are placed as shown in figure. The initial phase difference be2026Youngs Double Slit Experiment
- 3A single slit diffraction pattern is obtained using a beam of red light. If red light is replaced by blue light then2025Diffraction of Light
- 4Light of wavelength is incident on a thin glass plate of such that the angle of refraction into the plate is . Calculate the smallest thickn2024Interference of Light
- 5In a single-slit diffraction experiment, the slit is illuminated by light of two wavelength and . It is observed that the 2 nd order diffrac2024Diffraction of Light
- 6An interference pattern is obtained with two coherent sources of intensity ratio \( {n}: 1\). The ratio \( { {I}_{ {Max }}- {I}_{ {Min }}}{ 2023Interference of Light
- 7X-rays of wavelength \( \) gets reflected from parallel planes of atoms in a crystal with spacing \( {d}\) between two planes as shown in th2023Interference of Light
- 8In a Young's double slit experiment, the intensity of light at a point on the screen where the path difference between the interfering waves2022Youngs Double Slit Experiment
- 9In Young's double slit experiment with a monochromatic light, maximum intensity is 4 times the minimum intensity in the interference pattern2022Youngs Double Slit Experiment
- 10In Young's double slit experiment, light of wavelength passes through the double-slit and forms interference fringes on a screen away. If th2021Youngs Double Slit Experiment
- 11In a Frounhofer diffraction experiment, a single slit of width is illuminated by a monochromatic light of wavelength . The diffraction patte2020Youngs Double Slit Experiment
- 12In Young's experiment for the interference of light, the separation between the slits is and the distance of the screen from the slits is . 2019Youngs Double Slit Experiment
- 13When the frequency of the light used is changed from to . the angular width of the principal (central) maximum in a single slit Fraunhoffer 2019Youngs Double Slit Experiment
- 14If Young's double slit experiment is done with white light, which of the following statements will be true?2018Youngs Double Slit Experiment
- 15The intensity of a sound appears to an observer to be periodic. Which of the following can be the cause of it?2018Interference of Light
- 16For Fraunhoffer diffraction to occur2016Diffraction of Light
- 17A thin plastic sheet of refractive index 1.6 is used to cover one of the slits of a clouble slit arrangement. The central point on the scire2015Youngs Double Slit Experiment
- 18Find the right condition(s) for Fraunhoffer difiraction due to a single slit.2015Diffraction of Light
- 19Two coherent monochromatic beams of intensities and respectively are superposed. The maximum and minimum intensitien in the reaulting patter2014Interference of Light
- 20and are the coherent point sources of light located in the -plane at points (0,0) and respectively. Here is the wavelength of light. At whic2013Interference of Light
- 21In Young's double slit experiment the two slits are d distance apart. Interference pattern is observed on a screen at a distance D from the 2011Youngs Double Slit Experiment
- 22In Young's double slit experiment, the fringe width is . If the entire arrangement is placed in a liquid of refractive index , the fringe wi2010Youngs Double Slit Experiment
- 23The light beams of intensities in the ratio of are allowed to interfere. What will be the ratio of the intensities of maxima and minima?2010Youngs Double Slit Experiment
- 24Two identical light waves, propagating in the same direction, have a phase difference . After they superpose the intensity of the resulting 2009Youngs Double Slit Experiment
Frequently Asked Questions
1.How many questions are available for Wave Optics?
This chapter includes 24 questions compiled from WBJEE papers spanning 2009 to 2026.
2.Are these questions only from WBJEE, or from other exams too?
These are WBJEE questions specifically for the Wave Optics chapter. Questions from other exams like JEE Main or NTA Abhyas (JEE Main) are organised separately under their respective exam sections.
3.Is Wave Optics an important chapter for WBJEE Physics?
Wave Optics has appeared in 16 of the 18 years of WBJEE papers covered here, with 24 questions across 16 papers - about 2 per paper it appears in.
4.What is the difficulty level of Wave Optics questions in WBJEE?
Of the 24 questions analysed for this chapter, 58% are easy, 42% moderate and 0% tough. 2026 had the most, with 2 questions.
5.Which topics in Wave Optics should I focus on?
These topics have carried the most weightage in Wave Optics:
- Youngs Double Slit Experiment - 13 questions (54%)
- Interference of Light - 6 questions (25%)
- Diffraction of Light - 5 questions (21%)
6.Is Wave Optics's weightage in WBJEE going up or down?
Across all 16 papers analysed, Wave Optics has averaged about 1.5 questions per paper. In the last three years (2024–2026), that average has stayed about the same, at about 1.7 questions per paper. Use the year-wise numbers on this page for the exact trend before you decide how much time to give it.