1Draw a ray diagram showing the path of a ray of light entering through a triangular glass prism.
Deduce the expression for the reflective index of a glass prism in terms of the angle of minimum
deviation and angle of prism.
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A prism is a transparent refracting medium. It is bounded by three plane surfaces. A light ray enters the prism at one surface and leaves at the other. The angle between the two surfaces is called the angle of the prism.
OP=Incident ray
∠OPN = ∠i = Angle of incidence
PQ = Refracted ray
∠QPN' = ∠N'QP or, r1=r2=∠r
= angle of refraction
QR = Emergent ray
∠MQR = ∠e = Angle of emergence
∠LDQ = Angle of deviation
∠BAC = ∠A = Angle of prism
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