- When a ray of light strikes any boundary between two transparent substances, it is divided in to reflected ray and refracted ray.
θ1 =
θ1’
Where
θ1 =
Angle of incidence
θ1’ =
Angle of reflection
I = Incident ray
R’ = Reflected
ray
The incident ray
( I ) , reflected ray ( R’ ) and normal ( N ) are in one plane.
Laws of Refraction
It is known as
Snell’s law
( Sin θ1
/ Sin θ2 ) = ( µ1 / µ2 )
Where
θ1 =
Angle of incidence
θ2 =
Angle of refraction
µ1 = Refractive index of medium 1
µ2 = Refractive index of medium 2
The incident ray
( I ) , refracted ray ( R ) and normal ( N ) at the point of incidence are in
one place.
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