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Q. No.If a wave gets refracted into a denser medium, then which of the following is true?
1. wavelength, speed and frequency decrease.
2. wavelength increases, speed decreases and frequency remains constant.
3. wavelength and speed decrease but the frequency remains constant.
4. wavelength, speed and frequency increases.
Subtopic: Huygens' Principle |
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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 |
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In Young's double-slit experiment, the distance between the slits is \(2~\text{mm},\) and the screen is placed \(1.0~\text m\) away. If the wavelength of light used is \(600~\text{nm},\) the fringe separation will be:
1. \(0.3~\text{mm}\)
2. \(3.0~\text{mm}\)
3. \(0.6~\text{mm}\)
4. \(6.0~\text{mm}\)
1. \(0.3~\text{mm}\)
2. \(3.0~\text{mm}\)
3. \(0.6~\text{mm}\)
4. \(6.0~\text{mm}\)
Subtopic: Young's Double Slit Experiment |
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Unpolarised light of intensity \(X\) is incident on a polarising sheet. A second polaroid whose pass-axis makes an angle \(30^\circ\) with the pass-axis of the first polaroid is kept behind it. The intensity of the light that gets transmitted after the second polaroid is:
| 1. | \(X\) | 2. | \(\dfrac{3X}{8}\) |
| 3. | \(\dfrac{X}{4}\) | 4. | \(\dfrac{X}{2}\) |
Subtopic: Polarization of Light |
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In the phenomenon of interference of light, what happens to the energy?
| 1. | It is conserved but redistributed. |
| 2. | It is the same at every point. |
| 3. | It is not conserved. |
| 4. | It is created at the bright fringes. |
Subtopic: Superposition Principle |
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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 |
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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 |
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The interference pattern is obtained with two coherent light sources of intensity ratio 4 :1. And the ratio \(\frac{I_{\max }+I_{\min }}{I_{\max }-I_{\min }} \text { is } \frac{5}{x}\). Then, the value of x will be equal to:
1. 3
2. 4
3. 2
4. 1
1. 3
2. 4
3. 2
4. 1
Subtopic: Superposition Principle |
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The two light beams having intensities I and 9I interfere to produce a fringe pattern on a screen. The phase difference between the beams is \({\pi \over 2}\) at point P and \(\pi\) at point Q. Then the difference between the resultant intensities at P and Q will be:
1. \(2~\text I\)
2. \(6~\text I\)
3. \(5~\text I\)
4. \(7~\text I\)
1. \(2~\text I\)
2. \(6~\text I\)
3. \(5~\text I\)
4. \(7~\text I\)
Subtopic: Superposition Principle |
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Two light beams of intensities in the ratio of 9: 4 are allowed to interfere. The ratio of the intensity of maxima and minima will be:
1. 2: 3
2. 16: 81
3. 25: 169
4. 25: 1
1. 2: 3
2. 16: 81
3. 25: 169
4. 25: 1
Subtopic: Superposition Principle |
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