Hi,
I was just wondering about two questions I was trying to do in an ESA study guide.
Activity 5A: Plane mirrors

A ray of light makes an angle on 25 degrees with the normal to a plane mirror. The mirror is turned 6 degrees so that the answer becomes 31 degrees. Through what angle is the reflected ray rotated?

A boy 1.5 m tall whose eyes are 1.4m from the floor when he stands straight, can just see his complete image in a wall mirror.
a) What is the smallest length, l, of the mirror that allows the boy to see his complete image? The mirror is on a wall 3.0m from the boy.
2b) What is the height, h, of the mirror’s bottom edge from the floor?
The answer to 1) is 12 degrees, the answer to 2a) is 0.75m and the answer to 2b) is 0.70m. I don’t know how to work out these answers.
Can anyone help me?