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Light (MIX)
Light is a form of energy that travels away from the source producing it at
a speed of 
.
Crooke's radiometer shows that light is a form of energy.
It converts light energy into kinetic energy.
Light travels in straight lines.
Laws of Reflections of Light
(MIX)
Law 1: The incident ray, the normal ray at the point of incidence and the reflected
ray all lie in the same plane.
Law 2: The angle of incidence is equal to the angle of reflection (i
= r).
How an image is formed in a plane mirror. Notice that the image is virtual.
Virtual Image
(MIX)
A virtual image is formed by the apparent intersection of rays.
Such an image can never be formed on a screen. It can be located by the method
of no parallax
Parallax (MIX)
The apparent movement of one object relative to another due to the motion of
the observer is called parallax.
The object that is farthest from the observer always appears to move with the
observer.
Lateral Inversion
The reversal of left and right in a mirror is known as lateral inversion.