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  • 1(current)
Q. No.

Five identical polaroids are placed coaxially with \(45^{\circ}\) angular separation between pass axes of adjacent polaroids as shown in the figure. (\(I_0\): Intensity of unpolarized light)
          
The intensity of light, \(I\), emerging out of the \(5\)th polaroid is:

1. \(\dfrac{I_0}{4}\) 2. \(\dfrac{I_0}{8}\)
3. \(\dfrac{I_0}{16}\) 4. \(\dfrac{I_0}{32}\)
Subtopic:  Polarization of Light |
 76%
Level 2: 60%+
Hints

Which of the following statements indicates that light waves are transverse? 

1. Light waves can travel in a vacuum.
2. Light waves show interference.
3. Light waves can be polarized.
4. Light waves can be diffracted.

Subtopic:  Polarization of Light |
 76%
Level 2: 60%+
Hints
If the polarising angle for a material is \(60^{\circ},\) then the refractive index of the material will be:
1. \(\dfrac{1}{\sqrt{3}}\) 2. \(\dfrac{3}{2}\)
3. \(\sqrt{3}\) 4. \(\dfrac{\sqrt{3}}{2}\)
Subtopic:  Polarization of Light |
 83%
Level 1: 80%+
Hints
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A plane-polarized light with intensity \(I_0\) is incident on a polaroid with an electric field vector making an angle of \(60^{\circ}\) with the transmission axis of the polaroid. The intensity of the resulting light will be:

1. \(\dfrac{I_0}{4}\) 2. \(I_0\)
3. \(2I_0\) 4. \(\dfrac{I_0}{2}\)
Subtopic:  Polarization of Light |
 81%
Level 1: 80%+
Hints
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. \(\dfrac{2I}{3}\)
Subtopic:  Polarization of Light |
 83%
Level 1: 80%+
NEET - 2022
Hints
Two polaroids \(P_1\) and \(P_2\) are placed with their axis perpendicular to each other. Unpolarised light of intensity \(I_0\) is incident on \(P_1\). A third polaroid \(P_3\) is kept in between \(P_1\) and \(P_2\) such that its axis makes an angle \(45^{\circ}\) with that of \(P_1\). The intensity of transmitted light through \(P_2\) is:
1. \(\dfrac{I_0}{4}\) 2. \(\dfrac{I_0}{8}\)
3. \(\dfrac{I_0}{16}\) 4. \(\dfrac{I_0}{2}\)
Subtopic:  Polarization of Light |
 79%
Level 2: 60%+
NEET - 2017
Hints
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The Brewster's angle for an interface should be:
1. \(30^{\circ}<i_b<45^{\circ}\)
2. \(45^{\circ}<i_b<90^{\circ}\)
3. \(i_b=90^{\circ}\)
4. \(0^{\circ}<i_b<30^{\circ}\)

Subtopic:  Polarization of Light |
 75%
Level 2: 60%+
NEET - 2020
Hints

If the light is polarised by reflection, then the angle between reflected and refracted light is:

1. \(\pi\) 2. \(\dfrac{\pi}{2}\)
3. \(2\pi\) 4. \(\dfrac{\pi}{4}\)
Subtopic:  Polarization of Light |
 87%
Level 1: 80%+
Hints
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. \(30\%\)
Subtopic:  Polarization of Light |
 61%
Level 2: 60%+
Please attempt this question first.
Hints
Please attempt this question first.
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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 |
 69%
Level 2: 60%+
NEET - 2022
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