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Q. No.In Young's double-slit experiment, a student observes \(8\) fringes in a certain segment of the screen when a monochromatic light of \(600\) nm wavelength is used. If the wavelength of light is changed to \(400\) nm, then the number of fringes he would observe in the same region of the screen is:
1. \(12\)
2. \(6\)
3. \(8\)
4. \(9\)
Subtopic: Â Young's Double Slit Experiment |
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A linearly polarized monochromatic light of intensity \(10\) lumen is incident on a polarizer. The angle between the direction of polarization of the light and that of the polarizer such that the intensity of output light is \(2.5\) lumen is:
1. \(60^\circ\)
2. \(75^\circ\)
3. \(30^\circ\)
4. \(45^\circ\)
1. \(60^\circ\)
2. \(75^\circ\)
3. \(30^\circ\)
4. \(45^\circ\)
Subtopic: Â Polarization of Light |
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A monochromatic light of frequency \(500~\text{THz}\) is incident on the slits of Young's double slit experiment. If the distance between the slits is \(0.2~\text{mm}\) and the screen is placed at a distance \(1~\text{m}\) from the slits, the width of \(10\) fringes will be:
| 1. | \(1.5~\text{mm}\) | 2. | \(15~\text{mm}\) |
| 3. | \(30~\text{mm}\) | 4. | \(3~\text{mm}\) |
Subtopic: Â Young's Double Slit Experiment |
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After passing through a polarizer, a linearly polarized light of intensity \(I\) is incident on an analyser making an angle of \(30^\circ\) with the axes of the polariser. The intensity of light emitted from the analyser will be:
1. \(\dfrac{I}{2}\)
2. \(\dfrac{I}{3}\)
3. \(\dfrac{3I}{4}\)
4. \(\dfrac{2I}{3}\)
1. \(\dfrac{I}{2}\)
2. \(\dfrac{I}{3}\)
3. \(\dfrac{3I}{4}\)
4. \(\dfrac{2I}{3}\)
Subtopic: Â Polarization of Light |
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If the screen is moved away from the plane of the slits in Young's double slit experiment, then the:
| 1. | angular separation of the fringes increases. |
| 2. | angular separation of the fringes decreases. |
| 3. | linear separation of the fringes increases. |
| 4. | linear separation of the fringes decreases. |
Subtopic: Â Young's Double Slit Experiment |
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For Young's double-slit experiment, two statements are given below:
| Statement I: | If screen is moved away from the plane of slits, angular separation of the fringes remains constant. |
| Statement Ii: | If the monochromatic source is replaced by another monochromatic source of larger wavelength, the angular separation of fringes decreases. |
| 1. | Statement I is False but Statement II is True. |
| 2. | Both Statement I and Statement II are True. |
| 3. | Both Statement I and Statement II are False. |
| 4. | Statement I is True but Statement II is False. |
Subtopic: Â Young's Double Slit Experiment |
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Two coherent sources of light interfere and produce fringe patterns on a screen. For the central maximum, the phase difference between the two waves will be:
| 1. | zero | 2. | \(\pi\) |
| 3. | \(\dfrac{3\pi}{2}\) | 4. | \(\dfrac{\pi}{2}\) |
Subtopic: Â Superposition Principle |
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NEET - 2020
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If the monochromatic source in Young's double slit experiment is replaced by white light, then:
| 1. | there will be a central dark fringe surrounded by a few coloured fringes. |
| 2. | there will be a central bright white fringe surrounded by a few coloured fringes. |
| 3. | all bright fringes will be of equal width. |
| 4. | interference pattern will disappear. |
Subtopic: Â Young's Double Slit Experiment |
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An unpolarised light beam strikes a glass surface at Brewster's angle. Then:
| 1. | The refracted light will be completely polarised. |
| 2. | Both the reflected and refracted light will be completely polarised. |
| 3. | The reflected light will be completely polarised but the refracted light will be partially polarised. |
| 4. | The reflected light will be partially polarised. |
Subtopic: Â Polarization of Light |
 68%
Level 2: 60%+
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In Young's double slit experiment, if the wavelength of light used is increased (say from violet to red) then the:
| 1. | fringe width decreases. |
| 2. | fringe width increases. |
| 3. | central bright fringe becomes dark. |
| 4. | fringe width remains unaltered. |
Subtopic: Â Young's Double Slit Experiment |
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Level 1: 80%+
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