If the light is polarised by reflection, then the angle between reflected and refracted light is:
1.
2. /2
3. 2
4. /4
If the polarising angle for a material is , then the refractive index of the material will be:
1.
2.
3.
4.
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. \(\frac{I_0}{4}\)
2. \(I_0\)
3. \(2I_0\)
4. \(\frac{I_0}{2}\)
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. |
Five identical polaroids are placed coaxially with \(45^{\circ}\) angular separation between pass axes of adjacent polaroids as shown in the figure. (I0: Intensity of unpolarized light)
The intensity of light, I,
emerging out of the 5th polaroid is:
1.
2.
3.
4.
When an unpolarized light of intensity I0 is incident on a polarizing sheet, the intensity of the light which does not get transmitted is:
1. Zero
2. I0
3.
4.
Two polaroids P1 and P2 are placed with their axis perpendicular to each other. Unpolarised light of intensity Io is incident on P1. A third polaroid P3 is kept in between P1 and P2 such that its axis makes an angle 45° with that of P1. The intensity of transmitted light through P2 is:
1.
2.
3.
4.
Two polaroids are kept crossed to each other. Now one of them is rotated through an angle of . The percentage of incident light now transmitted through the system is:
1. 15%
2. 25%
3. 50%
4. 60%
Unpolarized light of intensity 32 Wm–2 passes through three polarizers such that the transmission axes of the first and second polarizer make an angle of 30° with each other and the transmission axis of the last polarizer is crossed with that of the first. The intensity of the final emerging light will be:
1. 32 Wm–2
2. 3 Wm–2
3. 8 Wm–2
4. 4 Wm–2
A beam of unpolarized light of intensity is passed first through a tourmaline crystal A and then through another tourmaline crystal B oriented so that its principal plane is parallel to that of A. The intensity of the final emergent light is I. The value of I is:
1.
2.
3.
4.