Image formation in a plane mirror
Note: A clear still surface of water behaves like a plane mirror. This explains why we see reflection of sceneries in a river
- The object is placed at A.
- The object could emit many rays of light, which are the incident rays. Now let us assume A-O1 and A-O2 are 2 incident rays.
- O1-N1 and O2-N2 are the normals at the point O1 and O2 for the incident rays.
- Draw the reflected rays (according to the laws of reflection) O1-B1 and O2-B2.
- Extend the reflected rays behind the surface of the mirror.
- The point at which they meet I, is the point a which the image of Object A is formed.
- Note that the distance from the object to the mirror is the same as the distance of the image to the mirror.