Brewster's Angle

Q. The angle of incidence at which, reflected ray is totally polarised for reflection from air to glass (refractive index $=n$) is:

1. ${\sin }^{-1}n$
2. ${\sin }^{-1}\frac{1}{n}$
3. ${\tan }^{-1}\frac{1}{n}$
4. ${\tan }^{-1}n$

Q.

Figure represents a glass plate placed vertically on a horizontal table with a beam of unpolarised light falling on its surface at the polarising angle of 57^o with the normal. The electric vector in the reflected light on screen S will vibrate with respect to the plane of incidence in a

[CPMT 1988]

1. Vertical plane

2. Horizontal plane

3. Plane making an angle of 45^o with the vertical

4. Plane making an angle of 57^o with the horizontal

Q. The angle of incidence at which, reflected ray is totally polarised for reflection from air to glass (refractive index $=n$) is:

1. ${\sin }^{-1}n$
2. ${\sin }^{-1}\frac{1}{n}$
3. ${\tan }^{-1}\frac{1}{n}$
4. ${\tan }^{-1}n$

Q. An unpolarised light is incident upon a glass plate of refractive index 1.54 at Brewster’s angle and gets completely plane polarized. The angle of polarization is: $(giventan{57}^{\circ }=1.54$)

1. ${57}^{\circ }$
2. ${46}^{\circ }$
3. ${33}^{\circ }$
4. ${82}^{\circ }$

Q. When a light ray is incident at polarising angle on the surface
1) Reflected ray is completely polarised
2) Refracted ray is partially polarised
3) Intensity of refracted ray is less than incident ray

1. 1, 2 are true
2. 1 is true
3. 2, 3 are true
4. 1, 2, 3 are true