Q 11 :

Unpolarised light is incident on the boundary between two dielectric media, whose dielectric constants are 2.8 (medium-1) and 6.8 (medium-2), respectively. To satisfy the condition, so that the reflected and refracted rays are perpendicular to each other, the angle of incidence should be ${\tan }^{-1}{(1+\frac{10}{\theta })}^{\frac{1}{2}}$; the value of $\theta$ is ______. (Given for dielectric media, ${\mu }_r=1$)                           [2023]
 

Q 12 :

Unpolarised light of intensity $32{\mathrm{Wm}}^{-2}$ passes through the combination of three polaroids such that the pass axis of the last polaroid is perpendicular to that of the pass axis of first polaroid. If intensity of emerging light is $3{\mathrm{Wm}}^{-2}$, then the angle between pass axis of first two polaroids is _________$°$.                [2023]

Q 13 :

An unpolarised light is incident at an interface of two dielectric media having refractive indices of 2 (incident medium) and $2\sqrt{3}$ (medium) respectively. To satisfy the condition that reflected and refracted rays are perpendicular to each other, the angle of incidence is ______.            [2026]

• 60°

   

• 30°

   

• 45°

   

• 10°

   

Q 14 :

When an unpolarized light falls at a particular angle on a glass plate (placed in air), it is observed that the reflected beam is linearly polarized. The angle of refracted beam with respect to the normal is ______.

$\left(ta{n}^{-1}\right(1.52)=57.7°,$ refractive indices of air and glass are 1.00 and 1.52, respectively.)    [2026]

• $36.3^{\circ }$

   

• $32.3°$

   

• $39.6°$

   

• $42.6°$