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MCQ Questions for Class 12 Physics Chapter 10 Wave Optics

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1. What happens if one of the slits, say S1 in Young’s double , slit experiment-is covered with a glass plate which absorbs half the intensity of light from it?




2. What happens to the interference pattern the two slits S1 and S2 in Young’s double experiment are illuminated by two independent but identical sources?




3. What is the reason for your answer to the above question?




4. A single slit diffraction pattern is obtained using a beam of red light What happened the red light is replaced by the blue light?




5. When a polaroid is rotated, the intensity of light varies but never reduces to zero. It shows that the incident light is:




6. When a polaroid is rotated, the intensity of light does not vary. The incident light may be:




7. For sustained interference, we need two sources which emit radiations :




8. Two sources of light are said to be coherent when both give out light waves of the same:




9. The intensity of light emerging from the two slits, in Young’s experiment is in the ratio 1 : 4. The ratio of,the intensity of the minimum to that of the consecutive maximum will be:




10. Poisson’s bright spot was discovered by:




11. The theory of expanding universe is confirmed by the observation of the spectral lines of the star, which shows :




12. The application of Doppler effect are:




13. Which of the following is conserved when light waves interefere?




14. In Young double slit experiment, a minimum is obtained when the phase difference of the superposing waves, is (n ∈ l):




15. The angle of minimum deviation of a prism depends upon the aggie of:




16. he minimum value of the refractive index is:




17. Polarization of light prove the :




18. Out of the following Statements which is not correct?




19. Polaroid glasses is used in sun glasses because :




20. In vacuum, the speed of light depends upon :




21. The fringe width (β) of a diffraction pattern and the slit width d are related as:




22. C.V. Raman was awarded the Nobel prize for his work associated with which of the following phenomenon of radiations?




23. Light takes 10-10 to cross a glass slab. What is the thickness of the glass slab?




24. In Young’s double slit experiment, the central point on the screen is:




25. In Young’s double slit experiment the distance between the slit and the screen is doubled and the separation between the slit is reduced to half. The fringe width:




26. In a Young’s double slit experiment the distance between the slit is 1 mm and the distance of screen from the slit is 1 m. If light of wavelength 6000 A is used then the fringe width is:




27. A person cannot see object clearly beyond 50 cm. The pow er of the lens to correct his vision is :




28. A phase difference of 5π corresponds to a path difference (in terms of λ) of:




29. A polaroid produces a strong beam of light which is :




30. Images of a distant lamp seen through a fire cloth rotate on rotating the cloth. This is due to the phenomenon of:




31. A young’s double slit experiment uses a monochromatic source. The shape of interference fringes formed on a screen is :




32. A monochromatic light is refracted from air into a glass of refractive index µ. The ratio of the wavelengths of the incident and the refracted waves is:




33. The focal length of the lens is 50 cm; then its power is:




34. In the above question, the number of the lens is:




35. The refractive index of diamond is about:




36. Two lenses having power +6 D and -4 D are placed in contact. The power of the combination is




37. Diffraction was discovered by :




38. The electromagnetic wave theory of light fails to explain :