Assertion (A): When a ray of light is refracted through a rectangular glass slab, there is no dispersion of light.

Reason (R): Dispersion of light is the phenomenon of splitting of white light into its constituent colours.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true and R is not the correct explanation of A.
3. assertion is false but reason is true.
4. assertion is true but reason is false.

Assertion (A): A beam of white light gives a spectrum on passing through a hollow prism.

Reason (R): The speed of light outside the prism is same as the speed of light inside the prism.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true and R is not the correct explanation of A.
3. assertion is false but reason is true.
4. assertion is true but reason is false.

Which colour of white light travels (a) fastest (b) slowest, in glass?

Name the subjective property of light related to its wavelength.