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Q. No.Out of the two slits of Young’s double-slit experiment, one of the slits is painted to make its intensity less than that of the other slit. Then:
1.
the fringes will disappear (uniform illumination).
2.
screen will become dark.
3.
the contrast between fringes will increase.
4.
the contrast between fringes will decrease.
Subtopic: Young's Double Slit Experiment |
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Two Nicols prisms (polariser and analyser) are oriented in such a way that the maximum amount of light is transmitted. Now, if the analyser is rotated by an angle of \(45^\circ\), what fraction of the maximum intensity of the light will be reduced?
1. \(25\%\)
2. \(75\%\)
3. \(50\%\)
4. \(30\%\)
1. \(25\%\)
2. \(75\%\)
3. \(50\%\)
4. \(30\%\)
Subtopic: Polarization of Light |
61%
From NCERT
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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: 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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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: Polarization of Light |
83%
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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 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 |
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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 |
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The energy in the phenomenon of interference:
| 1. | is conserved, gets redistributed |
| 2. | is equal at every point |
| 3. | is not conserved |
| 4. | is created in place of bright fringes |
Subtopic: Superposition Principle |
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Given below are two statements:
| Assertion (A): | If the phase difference between the light waves emerging from the slits of Young's experiment is \(\pi\) radian, the central fringe will be dark. |
| Reason (R): | Phase difference is equal to \((2\pi/\lambda)\) times of path difference. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Young's Double Slit Experiment |
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