Practice portal › JEE › Wave Optics

Interference and Young's Double Slit Experiment for JEE: 109 solved questions

Real JEE paper questions on interference and young's double slit experiment, part of wave optics. Each opens with the options, the correct answer and a step-by-step solution. Papers run from 2003 to 2026. No sign-in needed to read them.

What this topic asks

• Intensity and coherent sources — 48 questions
• Fringe width and fringe position — 41 questions
• Slabs, media and modified set-ups — 20 questions

All 109 questions with solutions

• Given below are two statements: Statement I: In a Young's double slit experiment, the angular separation of f… JEE Main 21st Jan 2nd Shift 2026
• In a Young's double slit experiment, the slits are separated by 0.2 mm. If the slits separation is increased… JEE Main 4th April 1st Shift 2025
• Given below are two statements. One is labelled as Assertion (A) and the other is labelled as Reason (R). Ass… JEE Main 22nd Jan 2nd Shift 2025
• The Young's double slit interference experiment is performed using light consisting of 480 nm and 600 nm wave… JEE Main 24th Jan 1st Shift 2025
• The width of fringe is 2 mm on the screen in a double slits experiment for the light of wavelength of 400 nm.… JEE Main 8th April 2nd Shift 2023
• In Young's double slit experiment, the position of 5th bright fringe from the central maximum is 5 cm. The di… JEE Main 25th Jan 1st Shift 2023
• Using Young's double slit experiment, a monochromatic light of wavelength 5000 Å produces fringes of fringe w… JEE Main 29th June 1st Shift 2022
• In the Young's double slit experiment, the distance between the slits varies in time as d(t) = d₀ + a₀ sin ω… JEE Main 25th July 1st Shift 2021
• In Young's double slit experiment, if the source of light changes from orange to blue, then JEE Main 27th July 1st Shift 2021
• In a Young's double slit arrangement, slits are separated by a gap of 0.5 mm, and the screen is placed at a d… JEE Main 18th March 1st Shift 2021
• If the source of light used in a Young's double slit experiment is changed from red to violet JEE Main 24th Feb 2nd Shift 2021
• In a Young's double slit experiment two slits are separated by 2 mm and the screen is placed one meter away.… JEE Main 26th Feb 1st Shift 2021
• Interference fringes are observed on a screen by illuminating two thin slits 1 mm apart with a light source (… JEE Main 2nd Sept 1st Shift 2020
• In a Young's double slit experiment, 16 fringes are observed in a certain segment of the screen when light of… JEE Main 2nd Sept 2nd Shift 2020
• In a Young's double slit experiment, light of 500 nm is used to produce an interference pattern. When the dis… JEE Main 3rd Sept 1st Shift 2020
• In a Young's double slit experiment, the separation between the slits is 0.15 mm. In the experiment, a source… JEE Main 7th Jan 2nd Shift 2020
• In a Young's double slit experiment, the slits are placed 0.320 mm apart. Light of wavelength λ = 500 nm is i… JEE Main 9th Jan 2nd Shift 2019
• In a Young's double slit experiment with slit separation 0.1 mm, one observes a bright fringe at angle 1/(40)… JEE Main 10th Jan 1st Shift 2019
• Consider a Young's double slit experiment as shown in figure. What should be the slit separation d in terms o… JEE Main 10th Jan 2nd Shift 2019
• In a Young's double slit experiment, slits are separated by 0.5 mm and the screen is placed 150 cm away. A be… JEE Main 2017
• Two coherent point sources S₁ and S₂ are separated by a small distance d as shown. The fringes obtained on th… JEE Main 2013
• The source that illuminates the double-slit in 'double-slit interference experiment' emits two distinct monoc… JEE Main Online 2013
• The maximum number of possible interference maxima for slit separation equal to 1.8λ, where λ is the waveleng… JEE Main Online 2012
• A mixture of light, consisting of wavelength 590 nm and an unknown wavelength, illuminates Young's double sli… JEE Main 2009
• A Young's double slit experiment uses a monochromatic source. The shape of the interference fringes formed on… JEE Main 2005
• The maximum number of possible interference maxima for slit-separation equal to twice the wavelength in Young… JEE Main 2004
• In two separate Young's double-slit experimental set-ups and two monochromatic light sources of different wav… JEE Main 23rd Jan 1st Shift 2026
• A beam of light consisting of wavelengths 650 nm and 550 nm illuminates the Young's double slits with separat… JEE Main 28th Jan 2nd Shift 2026
• A double slit interference experiment performed with a light of wavelength 600 nm forms an interference fring… JEE Main 28th Jan 1st Shift 2025
• Two wavelengths λ₁ and λ₂ are used in Young's double slit experiment. λ₁ = 450 nm and λ₂ = 650 nm. The minimu… JEE Main 4th April 1st Shift 2024
• In Young's double slit experiment, carried out with light of wavelength 5000 Å, the distance between the slit… JEE Main 5th April 1st Shift 2024
• In a double slit experiment shown in figure, when light of wavelength 400 nm is used, dark fringe is observed… JEE Main 29th Jan 1st Shift 2024
• A beam of light consisting of two wavelengths 7000 Å and 5500 Å is used to obtain interference pattern in You… JEE Main 6th April 2nd Shift 2023
• Two light waves of wavelengths 800 and 600 nm are used in Young's double slit experiment to obtain interferen… JEE Main 31st Jan 2nd Shift 2023
• In a Young's double slit experiment, a laser light of 560 nm produces an interference pattern with consecutiv… JEE Main 28th July 1st Shift 2022
• In Young's double slit experiment the two slits are 0.6 mm distance apart. Interference pattern is observed o… JEE Main 27th June 1st Shift 2022
• In a double slit experiment with monochromatic light, fringes are obtained on a screen placed at some distanc… JEE Main 29th June 2nd Shift 2022
• White light is passed through a double slit and interference is observed on a screen 1.5 m away. The separati… JEE Main 26th Aug 1st Shift 2021
• In a Young's double slit experiment, the slits are separated by 0.3 mm and the screen is 1.5 m away from the… JEE Main 31st Aug 2nd Shift 2021
• A fringe width of 6 mm was produced for two slits separated by 1 mm apart. The screen is placed 10 m away. Th… JEE Main 16th March 1st Shift 2021
• In a Young's double slit experiment 15 fringes are observed on a small portion of the screen when light of wa… JEE Main 9th Jan 2nd Shift 2020
• The maximum intensity in a Young's double slit experiment is I₀. Distance between the slits (d) is 5λ, where… JEE Main 5th April 2nd Shift 2026
• In interference experiment the path difference between two interfering waves at a point A on the screen is λ/… JEE Main 6th April 1st Shift 2026
• In a Young double slit experiment, the wavelength of incident light is 6000 Å, the separation between slits S… JEE Main 6th April 2nd Shift 2026
• In the Young's double slit experiment the intensity produced by each one of the individual slits is I₀. The d… JEE Main 24th Jan 2nd Shift 2026
• Two monochromatic light beams have intensities in the ratio 1 : 9. An interference pattern is obtained by the… JEE Main 3rd April 2nd Shift 2025
• Width of one of the two slits in a Young's double slit interference experiment is half of the other slit. The… JEE Main 3rd April 2nd Shift 2025
• In a Young's double slit experiment, the source is white light. One of the slits is covered by red filter and… JEE Main 8th April 2nd Shift 2025
• The width of one of the two slits in Young's double slit experiment is d while that of the other slit is xd.… JEE Main 23rd Jan 2nd Shift 2025
• The width of one of the two slits in a Young's double slit experiment is 4 times that of the other slit. The… JEE Main 4th April 2nd Shift 2024
• In Young's double slit experiment, light from two identical sources are superimposing on a screen. The path d… JEE Main 29th Jan 2nd Shift 2024
• The ratio of intensities at two points P and Q on the screen in a Young's double slit experiment where phase… JEE Main 10th April 2nd Shift 2023
• In a Young's double slits experiment, the ratio of amplitude of light coming from slits is 2 : 1. The ratio o… JEE Main 13th April 2nd Shift 2023
• In a Young's double slit experiment, two slits are illuminated with a light of wavelength 800 nm. The line jo… JEE Main 29th Jan 1st Shift 2023
• Two coherent sources of light interfere. The intensity ratio of two sources is 1 : 4. For this interference p… JEE Main 27th July 2nd Shift 2022
• Two light beams of intensities in the ratio of 9 : 4 are allowed to interfere. The ratio of the intensity of… JEE Main 24th June 2nd Shift 2022
• The two light beams having intensities I and 9I interfere to produce a fringe pattern on a screen. The phase… JEE Main 25th June 1st Shift 2022
• The interference pattern is obtained with two coherent light sources of intensity ratio 4 : 1. And the ratio… JEE Main 25th June 2nd Shift 2022
• Find the ratio of maximum intensity to the minimum intensity in the interference pattern if the width of the… JEE Main 30th June 1st Shift 2022
• The light waves from two coherent sources have same intensity I₁ = I₂ = I₀. In interference pattern the inten… JEE Main 27th Aug 2nd Shift 2021
• In a Young's double slit experiment, the width of one of the slit is three times the other slit. The amplitud… JEE Main 24th Feb 1st Shift 2021
• Two coherent light sources having intensity in the ratio 2x produce an interference pattern. The ratio (Iₘₐₓ… JEE Main 25th Feb 1st Shift 2021
• Two coherent sources of sound S₁ and S₂ produce sound waves of the same wavelength, λ = 1 m, in phase. S₁ and… JEE Main 5th Sept 2nd Shift 2020
• In the given figure, P and Q are two equally intense coherent sources emitting radiation of wavelength 20 m.… JEE Main 6th Sept 1st Shift 2020
• In a double-slit experiment, at a certain point on the screen the path difference between the two interfering… JEE Main 8th Jan 2nd Shift 2020
• In an interference experiment the ratio of amplitudes of coherent waves is (a₁)/(a₂) = 1/3. The ratio of maxi… JEE Main 8th April 1st Shift 2019
• In a Young's double slit experiment, the ratio of the slit's width is 4:1. The ratio of the intensity of maxi… JEE Main 10th April 2nd Shift 2019
• Two coherent sources produce waves of different intensities which interfere. After interference, the ratio of… JEE Main 9th Jan 1st Shift 2019
• In a Young's double slit experiment, the path difference, at a certain point on the screen, between two inter… JEE Main 11th Jan 1st Shift 2019
• In a Young's double slit experiment with light of wavelength λ the separation of slits is d and distance of s… JEE Main Online 2015
• Interference pattern is observed at P due to superimposition of two rays coming out from a source S as shown… JEE Main Online 2014
• In Young's double slit experiment, one of the slit is wider than other, so that the amplitude of the light fr… JEE Main 2012
• At two points P and Q on a screen in Young's double slit experiment, waves from slits S₁ and S₂ have a path d… JEE Main 2011 (Re-exam)
• In a Young's double slit experiment, the two slits act as coherent sources of waves of equal amplitude A and… JEE Main 2011 (Re-exam)
• In a Young's double slit experiment the intensity at a point where the path difference is λ/6 (λ being the wa… JEE Main 2007
• To demonstrate the phenomenon of interference we require two sources which emit radiation of JEE Main 2003
• In a Young's double slit experiment, the intensity at some point on the screen is found to be 3/4 times of th… JEE Main 2nd April 2nd Shift 2026
• Two coherent monochromatic light beams of intensities 4I and 9I are superimposed. The difference between the… JEE Main 3rd April 1st Shift 2025
• Two coherent monochromatic light beams of intensities I and 4I are superimposed. The difference between maxim… JEE Main 6th April 2nd Shift 2024
• In a Young's double slit experiment, the intensity at a point is (1/4)^th of the maximum intensity, the minim… JEE Main 9th April 1st Shift 2024
• In Young's double slit experiment, monochromatic light of wavelength 5000 Å is used. The slits are 1.0 mm apa… JEE Main 1st Feb 2nd Shift 2024
• Two waves of intensity ratio 1:9 cross each other at a point. The resultant intensities at that point, when (… JEE Main 31st Jan 1st Shift 2024
• In a Young's double slit experiment, the intensities at two points, for the path differences λ/4 and λ/3 (λ b… JEE Main 30th Jan 2nd Shift 2023
• Two beams of light having intensities I and 4I interfere to produce a fringe pattern on a screen. The phase d… JEE Main 27th July 1st Shift 2022
• Two light beams of intensities 4I and 9I interfere on a screen. The phase difference between these beams on t… JEE Main 29th July 1st Shift 2022
• The width of one of the two slits in a Young's double slit experiment is three times the other slit. If the a… JEE Main 1st Sept 2nd Shift 2021
• A Young's double-slit experiment is performed using monochromatic light of wavelength λ. The intensity of lig… JEE Main 6th Sept 2nd Shift 2019
• Two plane polarized light waves combine at a certain point whose electric field components are E₁=E₀ sin ω t… JEE Main 7th April 1st Shift 2025
• In a Young's double slit experiment, three polarizers are kept as shown in the figure. The transmission axes… JEE Main 24th Jan 2nd Shift 2025
• In Young's double slit experiment, the fringe width of the interference pattern produced on the screen is 2.4… JEE Main 5th April 1st Shift 2026
• In a double slit experiment the distance between the slits is 0.1 cm and the screen is placed at 50 cm from t… JEE Main 21st Jan 1st Shift 2026
• Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Ass… JEE Main 22nd Jan 1st Shift 2025
• A transparent film of refractive index 2.0 is coated on a glass slab of refractive index 1.45. What is the mi… JEE Main 22nd Jan 2nd Shift 2025
• Young's double slit interference apparatus is immersed in a liquid of refractive index 1.44. It has slit sepa… JEE Main 24th Jan 2nd Shift 2025
• In Young's double slit experiment, the fringe width is 12 mm. If the entire arrangement is placed in water of… JEE Main 26th July 1st Shift 2022
• In Young's double slit experiment performed using a monochromatic light of wavelength λ, when a glass plate (… JEE Main 28th June 2nd Shift 2022
• Two light waves having the same wavelength λ in vacuum are in phase initially. Then the first wave travels a… JEE Main 3rd Sept 2nd Shift 2020
• The figure shows a Young's double slit experimental setup. It is observed that when a thin transparent sheet… JEE Main 9th April 1st Shift 2019
• In a double slit experiment, when a thin film of thickness t having refractive index μ is introduced in front… JEE Main 12th April 1st Shift 2019
• Using monochromatic light of wavelength λ, an experimentalist sets up the Young's double slit experiment in t… JEE Main Online 2014
• Direction: The question has a paragraph followed by two statements, Statement-1 and Statement-2. Of the given… JEE Main 2011
• In a double slit experiment, when one of the slits is covered by a transparent mica sheet of refractive index… JEE Main 4th April 2nd Shift 2026
• In a Young's double slit experiment set up, the two slits are kept 0.4 mm apart and screen is placed at 1 m f… JEE Main 21st Jan 2nd Shift 2026
• A thin transparent film with refractive index 1.4 is held on a circular ring of radius 1.8 cm. The fluid in t… JEE Main 28th Jan 2nd Shift 2025
• Monochromatic light of wavelength 500 nm is used in Young's double slit experiment. An interference pattern i… JEE Main 9th April 2nd Shift 2024
• As shown in the figure, in Young's double slit experiment, a thin plate of thickness t = 10 μm and refractive… JEE Main 1st Feb 2nd Shift 2023
• In Young's double slit experiment, two slits S₁ and S₂ are d distance apart and the separation from slits to… JEE Main 30th Jan 1st Shift 2023
• In a Young's double slit experiment, an angular width of the fringe is 0.35° on a screen placed at 2 m away f… JEE Main 28th June 2nd Shift 2022
• The difference in the number of waves when yellow light propagates through air and vacuum columns of the same… JEE Main 27th July 2nd Shift 2021