Question

0.2 A short pulse of white light is travelling from air to glass slab at normal incidence. After
travelling through the slab, the last colour emerge out is​

Answer 1

Answer: A short pulse of white light is travelling from air to glass slab at normal incidence. After travelling through the slab, the last colour emerge out is red.

Explanation:

The velocity of red color light is highest among all the colors when travelling through the glass. Generally, the velocity of all colors of light is same in the air.

Answer 2

Answer:

The last color emerge out is violet.

Explanation:

while travelling in air the velocity of all the colors are same, but in glass they have the different velocity.

The wavelength of violet color is the shortest and that's why it bends the mostly.

That's why after travelling through glass slab the violet color will emerge last.