10 - PLANE MIRRORS

Question 1

Plane mirrors form images that are (4)

Answer 1

• Upright
• Virtual
• Same size of as the object
• As far behind the reflecting surface as the object is in front of it

Question 2

_________ is the angle between the incident ray and the normal to the plane mirror at the point of incidence,

_________ is the angle between the reflected ray and the normal to the surface.

Answer 2

angle of incidence
angle of reflection

Question 3

When the reflecting surface of the plane mirror is smooth, the incident ray, reflected ray and normal line lie in the same plane and the angle of incidence is _______ to the angle of reflection.

Answer 3

equal

Question 4

PROCEDURE B:
1. Draw a straight line across the width of the back of this page (preferably at the center). This is the __________. Place the plane mirror on the mirror line near the left end. The mirror should be perpendicular to the plane of the paper.

Answer 4

mirror line

Question 5

What is the relation between s and s’?

Answer 5

s = s’

Question 6

Derive mathematically the relationship between alpha and beta. (2alpha=beta)