In question #5, the one where you have to label the three pictures,
all of your labels are correct !
Look at the 3rd picture, where the light is coming down slanted,
hitting some kind of surface, and bouncing away slanted.
You labelled that picture "reflection", and that's correct.
Now, look at the two angles marked in the picture .... the angle
between the arriving light and the surface, and the angle between
the departing light and the surface.
There is a statement in Science called the "Law of Reflection".
It simply says that those two angles are EQUAL.
I don't think we have to get into WHY right now. I think that
at this point, your class is just trying to teach you what the law says.
If you go on and study more physics in High School, then you'll learn
WHY the angles are equal.
If the light ray arrives and hits the mirror at a 40° angle,
then it'll leave the mirror at a 40° angle. It's that simple.
The two angles are the ones marked equal in the picture
where you wrote 'reflection'.
