Direction of oscillation of wave

[somecelxis]

Homework Statement

Can you explain why the for Y , the direction of reflection is in and out of page ? p/s : the wording is in the photo. so i think it's needless to retype it again .

Homework Equations

The Attempt at a Solution

is it because for reflected ray, the ray will oscillate in and out of the page just as the reason (in your explanation above) ?
for Z , the light ray is not reflected because of the incident light only vibrate up and down to the plane of incident , so the light ray which oscillate in and out of the page doesn't exist at all , so the light is unreflected?

 

[BvU]

Don't see no "explanation above"...

If you want to check any of this, take a glass plate, put on polaroid sunglasses and hold another between a lamp and the glass plate !

Either that, or you google a few reflection polarization images...