Wave Optics
CBSE Class 12 Physics · every board question from this chapter, 2022–2026
- The shape of the interference fringes in Young's double-slit experiment, when the distance between the slit and the screen is…2026
- The phase difference between the two superimposing waves that give rise to a bright spot in a Young's double-slit experiment is…2026
- The angular width of interference fringes in Young's double-slit experiment depends on2026
- Four independent waves are expressed as (i) y_1=A_1 sin ω t (ii) y_2=A_2 sin 2 ω t (iii) y_3=A_3 cos ω t (iv) y_4=A_4 sin (ω t+π…2026
- The phenomenon of interference is shown by2026
- Assertion: In Young's double-slit experiment, the fringe width for dark and bright fringes is the same. Reason (R): Fringe width…2026
- Assertion: Light added to light can produce darkness. Reason (R): When two coherent light waves interfere, there is darkness at…2026
- A beam of light consisting of two wavelengths 400 nm and 600 nm is used to illuminate a single slit of width 1 mm. Find the least…2026
- Explain why diffraction of sound is more common in daily experience than that of light.2026
- In a Young's double-slit experiment, two waves each of intensity I superpose each other and produce an interference pattern.…2026
- State Huygens principle. How did Huygens justify the absence of the backwave on a spherical wavefront? OR In a single-slit…2026
- In Young's double slit experiment, the central maximum is bright in the interference pattern obtained on a screen. What will…2026
- In a Young's double-slit experiment, the two slits behave as coherent sources. When coherent light waves superpose over each…2026
- What are coherent sources? Why they are necessary for observing stable interference pattern? Draw a graph showing the variation…2026
- A beam of light of wavelength 720 nm in air enters water (refractive index =4/3 ). Its wavelength in water will be:2025
- Two coherent waves, each of intensity I_0, produce interference pattern on a screen. The average intensity of light on the screen…2025
- Two coherent light waves, each having amplitude 'a', superpose to produce an interference pattern on a screen. The intensity of…2025
- Assertion: Out of Infrared and radio waves, the radio waves show more diffraction effect. Reason (R): Radio waves have greater…2025
- Assertion: In double slit experiment if one slit is closed, diffraction pattern due to the other slit will appear on the screen.…2025
- In Young's double slit experiment, the screen is moved 30 cm towards the slits. As a consequence, the fringe width of the pattern…2025
- Find the angle of diffraction (in degrees) for first secondary maximum of the pattern due to diffraction at a single slit. The…2025
- Find the intensity at a point on the screen in Young's double slit experiment, at which the interfering waves of intensity I_0…2025
- In a double slit experiment, the two slits are 1.5 mm apart. The slits are illuminated by a mixture of lights of wavelengths of…2025
- In a double slit experiment, it is observed that the angular width of one fringe formed on the screen is 0.2^°. The wavelength of…2025
- In a double-slit experiment, 6^th dark fringe is observed at a certain point of the screen. A transparent sheet of thickness t…2025
- In a Young's double-slit experiment, the intensity at the central maximum in the interference pattern on the screen is I_0. Find…2025
- In a diffraction experiment, the slit is illuminated by light of wavelength 600 nm. The first minimum of the pattern falls at…2025
- Show the refraction of light wave at a plane interface using Huygens' principle and prove Snell's law.2025
- Write two differences in the patterns of double-slit interference experiment and single-slit diffraction experiment. Light waves…2025
- The ratio of the intensities at maxima to minima in Young's double-slit experiment is 25: 9. Calculate the ratio of intensities…2025
- "You cannot see a person standing on the other side of a boundary wall but can hear him." Explain with reason. Light of…2025
- In Young's double slit experiment, the separation between the two slits is 1.0 mm and the screen is 1.0 m away from the slits. A…2025
- Using the Huygens' principle, briefly describe reflection of a plane wavefront from a reflecting surface. Hence, prove the laws…2025
- The amplitude of a light wave becomes n times. This results in intensity of the wave becoming m times. What is the relation…2025
- Define 'wavefront' of a light wave. A plane wavefront is refracted from a convex lens. Draw the shape of the refracted wavefront.…2025
- A double slit set-up was initially placed in a tank filled with water and the interference pattern was obtained using a laser…2025
- Write the conditions under which two light waves originating from two coherent sources can interfere each other (i)…2025
- (i) (1) What are coherent sources? Why are they necessary for observing a sustained interference pattern? (2) Lights from two…2025
- In a Young's double-slit experiment in air, the fringe width is found to be 0.44 mm. If the entire setup is immersed in water…2024
- A Young's double-slit experimental set up is kept in a medium of refractive index (4/3). Which maximum in this case will coincide…2024
- Assertion: In a Young's double-slit experiment, interference pattern is not observed when two coherent sources are infinitely…2024
- Assertion: In interference and diffraction of light, light energy reduces in one region producing a dark fringe. It increases in…2024
- Two waves, each of amplitude 'a' and frequency ' ω ' emanating from two coherent sources of light superpose at a point. If the…2024
- What is a sustained or stable interference pattern? What are the conditions for obtaining such an interference pattern?2024
- Write two points of difference between interference and diffraction of light.2024
- Diffraction and interference are closely related phenomena that occur together. Diffraction is the phenomenon of bending of light…2024
- (i) Give any two differences between the interference pattern obtained in Young's double-slit experiment and a diffraction…2024
- (i) Give any two differences between the interference pattern obtained in Young's double-slit experiment and a diffraction…2024
- (i) A plane light wave propagating from a rarer into a denser medium, is incident at an angle i on the surface separating two…2024
- In a Young's double-slit experiment, the fringe width is found to be β. If the entire apparatus is immersed in a liquid of…2023
- In a Young's double-slit experiment, the screen is moved away from the plane of the slits. What will be its effect on the…2023
- In the wave picture of light, the intensity I of light is related to the amplitude A of the wave as:2023
- In a single-slit diffraction experiment, the width of the slit is halved. The width of the central maximum, in the diffraction…2023
- According to Huygens principle, the amplitude of secondary wavelets is2023
- In an interference experiment, third bright fringe is obtained at a point on the screen with a light of 700 nm. What should be…2023
- Assertion: The phase difference between any two points on a wavefront is zero. Reason (R): All points on a wavefront are at the…2023
- Assertion: In Young's double slit experiment all fringes are of equal width. Reason (R): The fringe width depends upon wavelength…2023
- In a Young's double slit experiment, the separation between the two slits is d and distance of the screen from the slits is 1000…2023
- State Huygens' principle. How did Huygens explain the absence of the backwave? OR Use Huygens' principle to show…2023
- Two coherent monochromatic light beams of intensities I and 4 I superpose each other. Find the ratio of maximum and minimum…2023
- What happens to the interference pattern when two coherent sources are infinitely close, and far apart from each other2023
- A plane wave-front propagating in a medium of refractive index ' μ_1 ' is incident on a plane surface making an angle of…2023
- A plane wave-front propagating in a medium of refractive index ' μ_1 ' is incident on a plane surface making an angle of…2023
- (i) In diffraction due to a single slit, the phase difference between light waves reaching a point on the screen is 5 π. Explain…2023
- Diffraction of light is bending of light around the corners of an object whose size is comparable with the wavelength of light.…2023
- How will the interference pattern in Young's double-slit experiment be affected if: (i) The screen is moved away from the plane…2022
- Monochromatic light of wavelength 600 nm is incident from air on a water surface. The refractive index of water is 1.33. Find the…2022
- A beam of light consisting of two wavelengths 600 nm and 500 nm is used in a Young's double slit experiment. The slit separation…2022
- Using Huygen's principle, for a plane wavefront incident on a plane reflecting surface, draw the reflected wavefront. Hence prove…2022
- Briefly explain how bright and dark fringes are formed on a screen due to the diffraction at a single slit. Hence, explain why…2022
- In a diffraction pattern due to a single slit, how will the angular width of central maximum change, if (i) Orange light is used…2022
- The interference pattern is not observed in Young's double slit experiment when the two sources S_1 and S_2 are far apart.…2022
- How can you differentiate whether a pattern is produced by a single slit or double slits? Derive the expression for the angular…2022
- Briefly explain how bright and dark fringes are formed on the screen in Young's double slit experiment. Hence, derive the…2022
- A parallel beam of light of wavelength 600 nm is incident normally on a slit of width 0.2 mm. If the resulting diffraction…2022
- How is the spacing between fringes in a double slit experiment affected if: (i) the slits separation is increased, (ii) the…2022
- In a Young's double slit experiment using light of wavelength 600 nm, the slit separation is 0.8 mm and the screen is kept 1.6 m…2022
- Electromagnetic waves of wavelengths λ_1, λ_2 and λ_3 are used in radar systems, in water purifiers and in remote switches of TV,…2022
- The principle of superposition is used to understand the phenomenon of interference of light waves. The principle states that at…2022
- The British physicist Thomas Young explained the interference of light using the principle of superposition of waves. He observed…2022
Answers come from CBSE’s own marking schemes. How we source them.