Refraction and Dispersion of Light through a Prism

A prism is a homogeneous

A prism is a homogeneous, transparent medium such as glass bounded by two plane surfaces inclined to each other at an angle. The two faces are the ref

The angle of deviation δ

The angle of deviation δ is the angle between the incident ray produced forward and the emergent ray produced backward. For a prism, δ = i + i′ − A, w

As the angle of incidence changes

As the angle of incidence changes, the deviation first decreases, becomes minimum for one particular incidence, and then increases again. At minimum d

At minimum deviation

At minimum deviation, the refractive index of prism glass with respect to air is n = sin[(A+δm)/2] / sin(A/2), where δm is the angle of minimum deviat

For a thin prism with angle

For a thin prism with angle A nearly 5° or less, the deviation is δm = (n−1)A. In this case, deviation depends only on refractive index and prism angl