HC Verma - Concepts of Physics Part 1

Book: HC Verma - Concepts of Physics Part 1

Chapter: 18. Geometrical Optics

Subject: Physics - Class 12th

Q. No. 31 of Exercises

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Light falls from glass (μ = 1.5) to air. Find the angle of incidence for which the angle of deviation is 90°.

Refractive index of glass is

Angle of incidence=i

Light ray is passing from glass to air i.e. from denser to rarer medium.

We know that;

Critical Angle=


Maximum angle of deviation in refraction is=

In reflection,

Deviation =


So, the angle of incidence=.


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