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Wave Optics - ISC Class 12 Physics Questions with Answers

57 past-paper questions on Wave Optics from ISC Class 12 Physics papers (2027-2018), newest first. Open one to see its answer.

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Fill in the blank with an appropriate term from the bracket: When a light wave travels from one medium to another, its ________… 2027 · 1 mark · Fill in
A physics teacher drew a ray diagram on the board as shown in Figure 8 below and asked the following questions to the students… 2027 · 3 marks · Short answer
Study the diagram shown in Figure 12 given below. Identify the following in Figure 12. (Understanding) A primary wavefront A… 2026 · 3 marks · Short answer
Figure 7 below illustrates Young’s double-slit experiment. $S_{1}$ and $S_{2}$ are coherent sources emitting light of wavelength… 2026 · 3 marks · Short answer
In Young’s double slit experiment, show that fringe width $\omega$ (fringe separation) is given by $\omega = \frac{\lambda D}{d}$… 2026 · 3 marks · Derivation
Answer the following questions with reference to Fraunhofer diffraction: Why does violet light produce a narrower diffraction… 2026 · 3 marks · Short answer
What type of wavefront is associated with sunlight? 2026 · 1 mark · Short answer
In Young's double slit experiment, the first bright band for blue light is closer to the centre than the first bright band for… 2026 · 1 mark · Assertion-reason
Kabir and Neha conducted experiments on light as part of their school project. Both of them worked with the same source of… 2026 · 3 marks · Short answer
Using Huygen's wave theory and a labelled diagram, show that angle of reflection (r) is equal to angle of incidence (i). 2026 · 3 marks · Derivation
When exposed to sunlight, a thin film of oil on water exhibits bright colours. Given below are two statements marked, Assertion… 2026 · 1 mark · Assertion-reason
With the help of a neatly drawn labelled diagram, prove the law of reflection on the basis of Huygen’s wave theory. 2025 · 3 marks · Derivation
For the given intensity versus phase difference graph of double-slit interference: If the graph depicts intensity versus phase… 2025 · 3 marks · Long answer
Shyam was performing a double slit experiment to determine wavelength of monochromatic light emitted by a laser. The examiner… 2025 · 3 marks · Short answer
Two identical rectangular slits $5\text{ mm}$ apart are illuminated with a monochromatic light of wavelength $600\text{ nm}$. The… 2025 · 3 marks · Numerical
Represent diagrammatically how the incident planar wavefronts of wavelength $\lambda$ pass through an aperture of size $d$, when… 2025 · 1 mark · Drawing
Student 1 and Student 2 conducted experiments using coherent sources of light, with Student 1 using a single slit and Student 2… 2025 · 5 marks · Long answer
In Young’s double slit experiment, how is interference pattern affected when the following changes are made: Slits are brought… 2025 · 3 marks · Short answer
Give the values of X and Y in terms of $\lambda$ and the corresponding phase difference. 2025 · 2 marks · Short answer
Phase difference between two overlapping waves to produce a bright band is $2\pi, 4\pi, 6\pi, 8\pi, \dots, 2n\pi$. 2025 · 1 mark · Assertion-reason
Redraw the diagram with the correct orientation of the obscured (hidden) optical device, so that when a plane wavefront is… 2025 · 1 mark · Drawing
A parallel beam of monochromatic light of wavelength $450\text{ nm}$ is incident normally on a rectangular slit of width… 2025 · 2 marks · Numerical
A parallel beam of light is travelling obliquely from an optically rarer medium to an optically denser medium. Draw a labelled… 2025 · 3 marks · Short answer
Diffraction of light is difficult to observe in everyday situations but can be observed in laboratory conditions. 2025 · 1 mark · Assertion-reason
With the help of a labelled diagram and Huygen’s wave theory, prove: When a parallel beam of light is incident obliquely on a… 2025 · 3 marks · Derivation
Draw a labelled graph showing the variation in intensity of diffracted light with diffracting angle in a single slit Fraunhofer… 2024 · 2 marks · Drawing
What type of wavefronts are associated with a point source of light? 2024 · 1 mark · Short answer
Using Huygen’s wave theory, show that (for refraction of light): $\frac{\sin i}{\sin r} = \text{Constant}$ where terms have their… 2024 · 3 marks · Derivation
In Young’s double slit experiment, show that: $\beta = \frac{\lambda D}{d}$ where the terms have their usual meaning. 2024 · 3 marks · Derivation
Using Huygen’s wave theory of light, show that the angle of incidence is equal to the angle of reflection. Draw a neat and… 2023 · 3 marks · Derivation
In a single slit Fraunhofer diffraction experiment, how does the angular width of central maximum change when the slit width is… 2023 · 1 mark · Short answer
Using Huygen’s wave theory, prove Snell’s law of refraction of light. 2023 · 3 marks · Derivation
Calculate the angular width of the central maxima obtained in Fraunhofer single slit diffraction experiment, when a monochromatic… 2023 · 3 marks · Numerical
What is the essential condition for obtaining a sustained interference? In Young’s double slit experiment, the distance of the… 2023 · 3 marks · Short answer
Cylindrical wavefronts are produced by: 2023 · 1 mark · MCQ
What type of wavefronts are associated with a source at infinity? 2023 · 1 mark · MCQ
In Young’s double slit experiment, what is the path difference between the two light waves forming 5th bright fringe on the… 2023 · 1 mark · Short answer
Give an example of coherent sources of light. 2023 · 1 mark · Short answer
In Young’s double slit experiment, what is the effect on fringe pattern if the slits are brought closer to each other? 2022 · 1 mark · MCQ
What is meant by Constructive interference? In Young’s double slit experiment, what should be the phase difference between the… 2022 · 2 marks · Short answer
In a single slit diffraction experiment, how does the angular width of the central maxima change when: screen is moved away from… 2022 · 3 marks · Short answer
What is meant by a wavefront? 2022 · 1 mark · Short answer
Using Huygen’s wave theory of light, prove Snell’s law of refraction of light. 2022 · 3 marks · Derivation
What is the phase difference between any two points lying on the same wavefront? 2020 · 1 mark · Short answer
In Young’s double slit experiment, the screen is kept at a distance of $1\cdot2\text{ m}$ from the plane of the slits. The two… 2020 · 3 marks · Short answer
Draw a labelled graph of intensity of diffracted light ($I$) versus angle ($\theta$) in the Fraunhofer diffraction experiment for… 2020 · 5 marks · Short answer
What should be the path difference between two waves reaching a point for obtaining constructive interference in Young’s Double… 2019 · 1 mark · Short answer
Draw a neat labelled diagram of Young’s Double Slit experiment. Show that $\beta = \frac{\lambda D}{d}$, where the terms have… 2019 · 5 marks · Derivation
Derive the law of reflection using Huygen’s Wave Theory. 2019 · 3 marks · Derivation
A beam of light is incident at the polarizing angle of $35^\circ$ on a certain glass plate. The refractive index of the glass… 2019 · 1 mark · MCQ
Ordinary (i.e. unpolarised) light is incident on the surface of a transparent material at the polarising angle. If it is partly… 2018 · 1 mark · Short answer
Using Huygen’s wave theory, derive Snell’s law of refraction. With the help of an experiment, state how will you identify whether… 2018 · 5 marks · Short answer
When a ray of ordinary light is incident on the surface of separation of two media at polarizing angle, show with the help of a… 2018 · 3 marks · Short answer
In Young’s double slit experiment, show graphically how intensity of light varies with distance. In Fraunhofer diffraction, how… 2018 · 3 marks · Short answer
Define coherent sources of light. 2018 · 1 mark · Short answer
State the Law of Malus. 2018 · 1 mark · Short answer
Draw a neat and labelled diagram of an experimental setup of Young’s double slit experiment to study the interference of light… 2018 · 5 marks · Derivation

Wave Optics - ISC Class 12 Physics Questions with Answers

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