Question

Two parallel rays of Red and Violet travelling through air, meet the air-glass boundary as shown in the above figure :

(i) Will their paths inside the glass be parallel? Give a reason for your answer.

(ii) Compare the speeds of the two rays inside the glass.

Answer 1

(i) No , the paths inside the glass will not be parallel.

Reason : Deviation suffered by each ray will be different because refractive index is different for different colours of light.

(ii) VR > Vv. In glass, the speed of red ray is greater than violet ray.