Laws
of Light
The laws that govern the light
are
·
Law of Reflection
·
Law of Refraction
Law
of Reflection:
The law states
that the light falling on a reflecting surface gets reflected at the same angle
from the surface. In other words the incident light ray and the reflected light
ray fall on the same plane with the normal.
This holds good in
place where the reflecting surface is planar. Angle between the incident ray to the normal is equal to the reflected ray to the
normal.
= 
(in degrees)
Law
of Refraction
Refraction
basically happens when light passes from one medium to another. It is simply
called as bending of light. The law
states that when light travels from one medium to another,
it generally bends, or refracts. The law
of refraction gives us a way of predicting the amount of bend. It is
also known as Snell's Law. It gives a relation between the angle of
incidence and angle of refraction.
Considering 
1 and 2 to be two different medium through which
light passes and 
1 to be the angle
made by the incident ray at the interface and 2 to be the angle made by the refracted ray at
the interface, then
n1 
= n2 
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