Refraction through a prism
Angle of Deviation: The angle between direction of incident ray and emergent ray is called angle of deviation.
Minimum deviation: At a particular angle of incidence, the angle of deviation is minimum and this angle is called the angle of minimum deviation.
Minimum Deviation: At a particular angle of incidence, the angle of deviation is minimum and this angle is called the angle of minimum deviation.
For small angled prism: =A(-1)
Grazing Incidence : When a ray of light is incidence on a face of a prism with an angle of incidence 90, the ray lies on the surface and is refracted through the prism. This refraction of the prism is called the grazing incidence.
Grazing Emergence or limiting angle of prism
The largest value for the angle of prism for which the incident and emergent ray travel along the refracting faces on the prism is called limiting angle of the prism.