- 1(current)
Q. No.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. | \(\frac{I}{2}\) | 2. | \(\frac{I}{3}\) |
| 3. | \(\frac{3I}{4}\) | 4. | \(\frac{2I}{3}\) |
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. \(0^{\circ}<i_b<30^{\circ}\)
Unpolarised light is incident from the air on a plane surface of a material of refractive index \(\mu\). At a particular angle of incidence \(i\), it is found that the reflected and refracted rays are perpendicular to each other. Which of the following options is correct for this situation?
| 1. | the reflected light is polarised with its electric vector parallel to the plane of incidence. |
| 2. | the reflected light is polarised with its electric vector perpendicular to the plane of incidence. |
| 3. | \(i = \text{sin}^{-1}\frac{1}{\mu}\) |
| 4. | \(i = \text{tan}^{-1}\frac{1}{\mu}\) |
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. \(\frac{I_0}{4}\)
2. \(\frac{I_0}{8}\)
3. \(\frac{I_0}{16}\)
4. \(\frac{I_0}{2}\)
- 1(current)
Q. No.
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