Engineering Physics I - Deviation due to prism

 

Deviation due to prism

Prism

It is a wedge shaped transparent reflecting object usually made of glass bounded by two plane faces inclined to each other at some angle.

The angle between the two inclined faces is called angle of prism (A).

fig. : Prism

Refraction through a prism:

When a ray of light is incident on a face of prism it gets refracted and bends towards the normal. On reaching the second face, it emerges out by bending away from the normal as shown in the figure below.

The angle between the emergent ray (RS) and the incident ray(PQ) is called angle of deviation(δ). 

Consider the angle of prism be A and the normal to the faces AB and AC be  N1N and N2N respectively.

Let i = angle of incidence at face AB

r1 = angle of refraction at face AB

r2 = angle of refraction at face AB

e = angle of emergence

δ = angle of deviation

δm = minimum angle of deviation

aµg = µg = refractive index of material of prism (glass)









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