The phenomenon of changing direction of light at interface of the two media when it travels from one medium to another obliquely is called ………………

B) the speed of light changes

A) x and y are true

B) Refractive index

B) relative refractive index

B) refractive index of 2nd medium with respect to 1st medium 

C) refractive index

C) critical angle

C) Equal to incident angle

(D) Light must travel from the medium of refractive index µ2 to µ1.

D) The disturbance travels