HC Verma - Concepts of Physics Part 1

Book: HC Verma - Concepts of Physics Part 1

Chapter: 18. Geometrical Optics

Subject: Physics - Class 8th

Q. No. 29 of Exercises

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29

Light is incident from glass (μ = 1.5) to air. Sketch the variation of the angle of deviation δ with the angle of incident i for 0<i<90°.

Refractive index of glass is


Refractive index of air is


Angle if incidence = i


29.PNG


Critical Angle=


So,





The angle of deviation due to refraction from glass to air increases as the angle of incidence increases from 0° to 40°48''. The angle of deviation due to total internal reflection further increases for 40°48'' to 45° and then it decreases, as shown in the above graph.


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