Question

Give reason.
The extent of duration of a ray of light on passing through a glass prism depends on its colour.

Answer 1

because there is a diff deviation for each colour so there is change in duration

Answer 2

It is the refractive index of the material of the prism upon which the deviation of a ray of light passing through a prism depends. It is found that refractive index is different for different color of light. It is maximum for violet light and minimum for red light. Hence, deviation is minimum of red light and maximum for violet light. Thus, the extent to which a ray of light deviates on passing through a prism depends on its color.