Question

Which colour of white light travel (a) fastest (b) slowest in glass prism
Which kind of mirrors are used in the headlights of a motor-car and why?
Why does a ray of light bend when it travels from one medium into anoth​

Answer 1

Answer:

When travelling through a medium the frequency remains unchanged and hence, speed depends upon the wavelength of light. Violet light having the least wavelength travels slowest.

Answer 2

red light travel fastest

vilotest slowest