STATEMENT -1: A white parallel beam of light is incident on a plane glass-vacuum interface as shown. The beam my not undergo dispesion after suffering deviation at the interface (The beam is not incident normally on the interface.)

STATEMENT -2: Vacuum has same refractive index for all colours of white light.

Options

A. Statement-`1` is True, Statement-`2` is True, Statement-`2` is a correct explanation for Statement -`1`
B. Statement-`1` is True, Statement-`2` is True, Statement-`2` is `NOT` a correct explanation for Statement -`1`
C. Statement-`1` is True, Statement-`2` is False
D. Statement-`1` is False, Statement-`2` is true

Answer

B

Explanation

If the angle of incidence is greater than critical angle for all colours, the beam will be torally internally reflrcted. The beam may not always suffer refraction and hence dispersion. Hence both statements are ture. Since statement-`2` has no connection with `TIR` , it is not an an explanation of statement-`1`