A light ray is refracting from air to an optically denser medium. If the refractive index of the given medium is increased, the angle of refraction will

[0.8 mark]

Q. When a ray of light travels from an optically more denser medium to an optically less denser medium, the angle of incidence is always .......... than the angle of refraction.

Q.

Consider a light ray travelling from a denser medium to air. The refractive index of the medium is $\sqrt{3}$. Calculate the angle of incidence, such that if it is further increased, total internal reflection will occur at the denser medium.

Q. Draw a labelled ray diagram to show how a ray of light is refracted when it passes:

(a) from air into an optically denser medium.
(b) from an optically denser medium into air.

Q. A light ray refracted from air to a denser medium. The angle of incidence is 60° and the angle of refraction is 30°. If the speed of light in air is $3\times {10}^{8}m/s$, find the speed of light in the denser medium.

[2 marks]

Q. When light is travelling from denser medium to air at an angle of incidence $\Theta$ , a part of light is reflected and rest is refracted . The refractive index of denser medium is $\frac{\sqrt{7}}{2}$ and the angle between reflected and refracted ray is ${90}^0$.
Find the value of angle $\Theta$