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Class 12 Physics: Wave Optics
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MCQs on huygens principle, plane refraction and reflection using huygens principle, coherent and incoherent addition of waves, light waves interference and youngs experiment, diffraction and polarisation.

Class 12 Physics: Wave Optics
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25 Questions

1. What is the cause of diffraction?
2. In Young's double-slit experiment with monochromatic light, how is fringe width affected, if the screen is moved closer to the slits?
3. Pick the odd one out.
4. A light wave enters from air into glass. How will the frequency of the wave be affected?
5. If a wave undergoes refraction, what will be the phase change?
6. Which field vector is used to represent the polarization of an em wave?
7. What should be the order of the size of an obstacle or aperture for diffraction light?
8. Identify the factor is not the same for coherent waves.
9. State the essential condition for diffraction of light to occur.
10. The wavelength of light coming from a sodium source is 589 nm. What will be its wavelength in the water?
11. What is the polarization angle of a medium of refractive index √3?
12. What are sunglasses made of?
13. Identify the property which is not mutually perpendicular to the polarized light wave in a plane.
14. In Young's double-slit experiment, the two parallel slits are made one millimeter apart and a screen is placed one meter away. What is the fringe separation when blue-green light of wavelength 500 nm is used?
15. The speed of the yellow light in a certain liquid is 2.4 × 108 m/s. Find the refractive index of the liquid.
16. Which among the following isn't a suitable phenomenon to establish that light is wave motion?
17. The speed of light in air is 3 × 108 m/s. If the refractive index of glass is 1.5, find the time taken by light to travel a distance of 10 cm in the glass.
18. A small circular disc is placed in the path of light from a distant source. Identify the nature of the fringe produced.
19. The absolute refractive indices of glass and water are \(\frac {3}{2}\) and \(\frac {4}{3}\). Determine the ratio of the speeds of light in glass and water.
20. What would be the resultant intensity at a point of constructive interference, if there are two identical coherent waves of intensity I’ producing an interference pattern?
21. Which plane is defined as the plane of polarization in a plane-polarized electromagnetic wave?
22. What happens to the interference pattern if the phase difference between the two sources varies continuously?
23. The optical path of monochromatic light is the same if it travels 2 cm thickness of glass or 2.25 cm thickness of water. If the refractive index of water is 1.33, what is the refractive index of glass?
24. The refractive index of glass is 1.5 and that of water is 1.3, the speed of light in water is 2.25 × 108 m/s. What is the speed of light in glass?
25. Determine the half angular width of the central maximum, if a wavelength of 1000 nm is observed when diffraction occurs from a single slit of 2 μm width.

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