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Q. No.The slits in a Young's double-slit experiment have equal width and the source is placed symmetrically with respect to the slits. The intensity at the central fringe is \(I_0.\) If one of the slits is closed, the intensity at this point will be:
1. \(I_0\)
2. \(I_0/4\)
3. \(I_0/2\)
4. \(4I_0\)
1. \(I_0\)
2. \(I_0/4\)
3. \(I_0/2\)
4. \(4I_0\)
Subtopic: Young's Double Slit Experiment |
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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%
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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 |
64%
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When a drop of oil is spread on a water surface, it displays beautiful colours in daylight because of:
| 1. | dispersion of light | 2. | reflection of light |
| 3. | polarization of light | 4. | interference of light |
Subtopic: Superposition Principle |
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The wavefronts of a light wave travelling in vacuum are given by \(x+y+z=c\). The angle made by the direction of propagation of light with the X-axis is:
1. \(0^{\circ}\)
2. \(45^{\circ}\)
3. \(90^{\circ}\)
4. \({\cos^{-1}\left({1}/{\sqrt{3}}\right )}\)
Subtopic: Huygens' Principle |
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Red light is used in a single slit diffraction experiment with a slit width of \(0.6~\text{mm}\). If the red light is replaced by yellow light, then the observed pattern will reveal:
| 1. | that the central maximum is wider. |
| 2. | more number of fringes. |
| 3. | less number of fringes. |
| 4. | no diffraction pattern. |
Subtopic: Diffraction |
50%
From NCERT
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The width of the central maximum of the diffraction pattern of a single slit of width \(1~\text{mm}\) equals the width of the slit itself, when the screen is \(1~\text m\) away from it. The wavelength of light used equals:
| 1. | \(250~\text{nm}\) | 2. | \(500~\text{nm}\) |
| 3. | \(1000~\text{nm}\) | 4. | \(2000~\text{nm}\) |
Subtopic: Diffraction |
68%
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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. \(9\)
1. \(12\)
2. \(6\)
3. \(8\)
4. \(9\)
Subtopic: 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. | \(45^\circ\) |
Subtopic: Polarization of Light |
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NEET - 2022
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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: Young's Double Slit Experiment |
59%
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NEET - 2022
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