DEFINITIONS: GEOMETRICAL OPTICS 1

1. Light      (MIX)
   Light is a form of energy that travels away from the source producing it at a speed of .
   
   
2. Laws of Reflection 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).
   
   
3. 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
   
   
4. 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.
   
   
5. Real Image     (MIX)
   A real image is an image formed by the actual intersection of light rays.
   Such an image can be located on a screen or by the method of no parallax.
   
   
6. For a Concave Mirror...     (MIX)
   If the object is outside the focus the image is real and is located in front of the mirror.
   If the object is inside or at the focus the image is virtual and is located behind the mirror.
   
   
7. Light from a Distant Object      (MIX)
   Light from any point on a distant object arrives as a beam of parallel light.
   
   
8. For a Convex Mirror      (MIX)
   The image is always virtual and located behind the mirror.
   The image is always diminished. The nearer the object is to the mirror the bigger the image.