OPTICS

                   REFLECTION OF LIGHT

It is the bouncing back of the light in the same medium when the light falls on a surface.

LAWS OF REFLECTTION

1. Angle of incidence is always equal to the angle of reflection.

angle i = angle r

2. The incident ray , reflected ray and normal are coplanar.

where i = angle of incidence

           r = angle of reflection

SOME CHARACTERSTICS OF REFLECTION

1. If object moves with a velocity v ( say 10 m/s ), the image will move with a velocity 2v (20 m/s)

    in plane mirror.

2. If height of a person is 170 cm , then then to see full image, the length of plane mirror required is 

    170/2 = 85 cm.