How is a wavefront related to the direction of corresponding rays ?

A beam of unpolarised light is incident on the boundary between two transparent media.If the reflected light is completely plane polarised,how is its direction related to the direction of the corresponding refracted light?

A wavefront is

How is the direction of current related to the direction of flow of electron in a wire?

In the adjacent diagram, CP represents a wavefront and AO & BP, the corresponding two rays. Find the condition on theta for constructive interference at P between the ray BP and reflected ray OP.

In the adjacent diagram, CP represents a wavefront and AO & BP, the corresponding two rays. Find the condition on theta for constructive interference at P between the ray BP and reflected ray OP.

In the adjacent diagram, CP represents a wavefront and AO & BP, the corresponding two rays. Find the condition on theta for constructive interference at P between the ray BP and reflected ray OP.

A perpendicular drawn to the wavefront in the direction of propagation of light is