Read the following statements carefully
(i) The prism behaves same as that of rectangular glass slab.
(ii) All the colours have different angles of deviation in case of dispersion through prism.
(iii) All the colours travel with the same speed of light in glass.
(iv) Dispersion of light is observed in case of rectangular glass slab. Which of the above statement/s is true?

Options

A. Only (ii)
B. (i) and (ii) only
C. (i), (ii) and (iv) only
D. All of the above

Answer

A

Explanation

A prism is made up of glass in which the faces are joined at a certain angle but in case of rectangular glass slab, the opposite faces are parallel to each other. As the light enters in the prism, all the colours travel with the different speed of light because glass is a denser medium as compared to air and dispersion of light is not observed in case of a rectangular glass slab. So, both prism and rectangular glass slab behave differently.