How is the critical angle related to the refractive index of a medium?

The critical angle for glass-air is 45° for the light of yellow colour. State whether it will be less than, equal to, or more than 45° for

(i) red light,

(ii) blue light ?

Fill in the blanks to complete the following sentences —

(a) Total internal reflection occurs only when a ray of light passes from a ………. medium to a ………. medium.

(b) Critical angle is the angle of ………. in denser medium for which the angle of ………. in rarer medium is ……….

State whether the following statement is true or false —

If the angle of incidence is greater than the critical angle, light is not refracted at all, when it falls on the surface from a denser medium to a rarer medium.