Light Incident on Another Medium

Q. When a ray of light is incident at angle of ${60}^{\circ }$to a medium of refractive index n, it is observed that the angle of refraction is half of the angle of incidence. The value of n is

1. $\frac{1}{\sqrt{3}}$
2. $\frac{\sqrt{3}}{2}$
3. $\sqrt{3}$
4. $\frac{2}{\sqrt{3}}$

Q. Find out θ if light is falling on the pole of a concave mirror. [1 Marks]


a) 45°
b) 30°
c) 60°
d) 90°

Q. A small source of light is 4m below the surface of a liquid of refractive index 5/3. In order to cut off all the light coming out of liquid surface, minimum diameter of the disc placed on the surface of liquid is

1. 4m
2. 6m
3. 3m
4. $\infty$

Q. Light ray travels from a known medium to an unknown medium. Match the cards for the unknown medium.

1. Same medium
2. Denser medium
3. Rarer medium
4. 
5. 
6.