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Q. No.A light wave can travel:
| (a) | in vacuum |
| (b) | in vacuum only |
| (c) | in a material medium |
| (d) | in a material medium only |
Choose the correct option from the options given below:
| 1. | (a) and (b) only |
| 2. | (b) and (c) only |
| 3. | (a) and (c) only |
| 4. | (c) and (d) only |
Subtopic: Huygens' Principle |
90%
Level 1: 80%+
Hints
In Young’s double slit experiment, the two slits are \(0.6\) mm distance apart. The interference pattern is observed on a screen at a distance of \(80\) cm from the slits. The first dark fringe is observed on the screen directly opposite to one of the slits. The wavelength of light will be:
1. \(450\) nm
2. \(550\) nm
3. \(650\) nm
4. \(750\) nm
1. \(450\) nm
2. \(550\) nm
3. \(650\) nm
4. \(750\) nm
Subtopic: Young's Double Slit Experiment |
78%
Level 2: 60%+
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Hints
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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: Young's Double Slit Experiment |
Level 3: 35%-60%
NEET - 2023
Hints
A parallel beam of light of wavelength \(600\) nm falls normally on a slit of width \(a.\) What should the value of \(a\) so that the first-order diffraction minimum occurs at an angle of \(30^\circ\)?
1. \(1.1\times10^{-6}~\text{m}\)
2. \(1.2\times10^{-6}~\text{m}\)
3. \(1.3\times10^{-6}~\text{m}\)
4. \(1.4\times10^{-6}~\text{m}\)
1. \(1.1\times10^{-6}~\text{m}\)
2. \(1.2\times10^{-6}~\text{m}\)
3. \(1.3\times10^{-6}~\text{m}\)
4. \(1.4\times10^{-6}~\text{m}\)
Subtopic: Diffraction |
85%
Level 1: 80%+
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In Young's double-slit experiment, slits are separated by \(0.5~\text{mm}\) and the screen is placed \(150~\text{cm}\) away. A beam of light consisting of two wavelengths, \(650~\text{nm}\) and \(975~\text{nm}\) is used to obtain interference fringes on the screen. The least distance from the common central maximum to the point where the bright fringes due to both wavelengths coincide is:
1. \(5.85~\text{mm}\)
2. \(7.8~\text{mm}\)
3. \(4.2~\text{mm}\)
4. \(3.6~\text{mm}\)
1. \(5.85~\text{mm}\)
2. \(7.8~\text{mm}\)
3. \(4.2~\text{mm}\)
4. \(3.6~\text{mm}\)
Subtopic: Young's Double Slit Experiment |
63%
Level 2: 60%+
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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: Polarization of Light |
69%
Level 2: 60%+
NEET - 2022
Hints
Huygens' principle of secondary wavelets may be used to:
Choose the correct option from the options given below:
| (a) | Find the velocity of light in a vacuum. |
| (b) | Explain the particle behaviour of light. |
| (c) | Find the new position of a wavefront. |
| (d) | Explain Snell's law. |
Choose the correct option from the options given below:
| 1. | (a) and (b) only |
| 2. | (b) and (c) only |
| 3. | (c) and (d) only |
| 4. | all of the above |
Subtopic: Huygens' Principle |
65%
Level 2: 60%+
Hints
The intensities of light coming from two different slits are in the ratio \(1:4\) in Young's double-slit experiment. The ratio of intensities corresponding to the maxima and minima in the interference pattern would be:
1. \(\sqrt2:1\)
2. \(2:1\)
3. \(4:1\)
4. \(9:1\)
1. \(\sqrt2:1\)
2. \(2:1\)
3. \(4:1\)
4. \(9:1\)
Subtopic: Young's Double Slit Experiment |
88%
Level 1: 80%+
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In Young’s double-slit experiment using monochromatic light of wavelength \(\lambda,\) the intensity of light at a point on the screen where path difference \(\lambda\) is \(K\) units. What is the intensity of the light at a point where path difference is \(\lambda/3\)?
1. \(\dfrac K3\)
2. \(\dfrac K4\)
3. \(\dfrac K2\)
4. \(K\)
Subtopic: Superposition Principle |
65%
Level 2: 60%+
Hints
In a double-slit experiment using light with a wavelength of \(628\) nm, the angular width of a fringe formed on the screen is \(0.1^\circ.\) The separation between the slits is: (use \(\pi=3.14 \))
1. \(3.6\times 10^{-5}~\text{m}\)
2. \(3.6\times 10^{-4}~\text{m}\)
3. \(3.6\times 10^{-5}~\text{cm}\)
4. \(3.6\times 10^{-4}~\text{cm}\)
1. \(3.6\times 10^{-5}~\text{m}\)
2. \(3.6\times 10^{-4}~\text{m}\)
3. \(3.6\times 10^{-5}~\text{cm}\)
4. \(3.6\times 10^{-4}~\text{cm}\)
Subtopic: Young's Double Slit Experiment |
69%
Level 2: 60%+
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