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Applied Physics 1: Interference In Thin Film
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Applied Physics 1: Interference In Thin Film
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25 Questions

1. In Newton's ring experiment, the diameter of the 10th ring changes from 1.40 to 1.23 cm when a liquid is introduced between the lens and glass plate. What is the refractive index of the liquid?
2. What kind of sources are required for Young's Double Slit experiment?
3. The shape of the pattern depends on the ____________
4. A thin sheet of refractive index 1.25 and thickness 0.5 cm is placed in the path of light from one source in the Young's double slit experiment. What is the path difference observed?
5. When a plate of thickness 0.05 mm is placed in the path of a Michaelson Interferometer, a shift of 100 fringes is observed for a light of wavelength 5000 λ. What is the refractive index of the plate?
6. When Two waves of same amplitude add constructively, the intensity becomes _____________
7. In YDS, the width of the fringes obtained from a light of wavelength 500 nm is 3.6 mm. What is the fringe width id the apparatus is immersed in a liquid of refractive index 1.2?
8. When a thin plate of refractive index 1.5 is placed in the path of one of interfering beams of Michaelson Interferometer, a shift of 30 fringes is observed. If the thickness of plate is 0.018 mm, the wavelength of the used light is ___________
9. Which of the following does not show any interference pattern?
10. Two narrow and parallel slits 0.08 cm apart are illuminated by a light of frequency 6 X 1011 kHz. At what distance from the slits should the screen be placed to obtain fringe width of 0.6 mm?
11. Zero order fringe can be identified using ____________
12. A Young's double slit apparatus is immersed in a liquid of refractive index 1.25. What is the ratio of the fringe width in air and liquid?
13. There is no effect on the interference pattern when the width of the slit is increased.
14. A thin layer of colorless oil is spread over water in a container (μ = 1.4)). If the light of wavelength 640 nm is absent in the reflected light, what is the minimum thickness of oil layer?
15. In a Young's double slit experiment, the distance between the two slits is 0.5 mm and the distance between the screen and the slits is 1 m. When a light of wavelength 500 nm is incident on the slits, what would be distance between the two second bright fringes?
16. In Young's Double Slit experiment, the angular width of the fringe is 0.1o. If the light used has a wavelength of 600 nm, what is the spacing between the slits?
17. The shape of the fringes observed in interference is ____________
18. The visibility of fringes is given by the expression ___________
19. In Young's Double Slit Experiment, if instead of monochromatic light white light is used, what would be the observation?
20. A thin sheet of refractive index 1.5 and thickness 1 cm is placed in the path of light. What is the path difference observed?
21. The interference pattern is observed in the soap bubble, thick film, and wedge-shaped film. Interference is observed only when the phase difference between the two waves is zero.
22. Young's Double Slit Experiment was conducted in ______________
23. If instead of monochromatic light white light is used for interference of light, what would be the change in the observation?
24. If the distance between the two slits is doubled, the fringe width _________
25. What change is observed when the whole pattern is immersed in water?

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