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NCERT CBSE CLASS 12 PHYSICS CHAPTER WISE MCQ

Welcome to your Chapter 10 Wave Optics MCQs

1. 
Identify the condition which is not necessary for two light waves to be coherent.
2. 
Which among the following isn’t a suitable phenomenon to establish that light is wave motion?
3. 
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?
4. 
The absolute refractive indices of glass and water are 3/2 and 4/3. Determine the ratio of the speeds of light in glass and water.
5. 
The speed of yellow light in a certain liquid is 2.4 × 10∧8 m/s. Find the refractive index of the liquid.
6. 
The wavelength of light coming from a sodium source is 589 nm. What will be its wavelength in the water?
7. 
A light wave enters from air into glass. How will the energy of the wave be affected?
8. 
If a wave undergoes refraction, what will be the phase change?
9. 
When a wave undergoes reflection at a denser medium, what will be the phase change?
10. 
A light wave enters from air into glass. How will the frequency of the wave be affected?
11. 
Which of the following is a form of light whose photons share the same frequency and whose wavelengths are in phase with one another?
12. 
Which among the following is an example of coherent sources?
13. 
Pick the odd one out.
14. 
Identify the factor is not the same for coherent waves.
15. 
When is the wave interference strong?
16. 
In Young’s double-slit experiment with monochromatic light, how is fringe width affected, if the screen is moved closer to the slits?
17. 
In Young’s double-slit experiment, lights of green, yellow, and orange colors are successively used. Write the fringe widths for the three colors in increasing order.
18. 
What happens to the interference pattern if the phase difference between the two sources varies continuously?
19. 
What will be the effect on the fringes formed in Young’s double-slit experiment if the apparatus is immersed in water?
20. 
If the separation between the two slits is decreased in Young’s double-slit experiment keeping the screen position fixed, what will happen to the width of the fringe?

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