Question

9. Two parallel rays of red and violet colour travelling through air, meet the air-glass boundary.

Red

Violet

Air

Glass
i. Will their paths inside the glass be parallel? Give reason for your answer.
ii. Compare the speeds of the two rays inside the ​glass

Answer 1

Answer:

hope it helps

Explanation:

No, paths inside the glass will not be parallel. As shown in the figure, both will refract through a different angle. ii) Red deviates less and violet deviates more. Therefore, the speed of red in glass is more than the speed of violet in glass.

Answer 2

Answer:

(a) Since the refractive index of glass for violet colour is more. (µr < µv) So, in glass, the red light travel faster than violet light. The paths inside the glass will not be parallel.  

(b) Velocity of red colours will be more than that of the violet colour.

Explanation:

The two refracted rays inside glass are not parallel . Because the refractive index of glass is less for Red light,  while it is more for violet light (µr < µv), So RED ray is deviated less while the violet is deviated more i.e. angle of refraction r1 for red is more than angle of refraction r2 for violet ray.