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Class 12 Physics Practice Test: Interference of Light Waves and Young's Experiment
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Avg score: 66% • Most missed: “Two independent light sources act as coherent sources’.”

This experiment played a major role in the general acceptance of the wave theory of light.

Class 12 Physics Practice Test: Interference of Light Waves and Young's Experiment
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10 Questions

1. 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?
2. What will be the effect on the fringes formed in Young’s double-slit experiment if the apparatus is immersed in water?
3. In Young’s double-slit experiment with monochromatic light, how is fringe width affected, if the screen is moved closer to the slits?
4. In Young’s double-slit experiment if the distance between two slits is halved and distance between the slits and the screen is doubled, then what will be the effect on fringe width?
5. 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?
6. 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.
7. Two independent light sources act as coherent sources’.
8. In Young’s double-slit experiment if the distance between two slits is halved and distance between the slits and the screen is doubled, then what will be the effect on fringe width?
9. 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.
10. 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?

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