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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31

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 =


Or,



So, the angle of incidence=.


1

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