ICSE Class 10 Answered
A ray of light incident normally on a prism of 60 degree angles .Show the path of the light ray till it emerges out of the prism. The critical angle of glass is 42 degree
Asked by paldebtaru | 19 Jun, 2021, 08:21: AM
Expert Answer
Light ray incident normally on side of prism at A . As seen from figure , light ray incident with angle of incidence 60o at B on oposite side .
Since angle of incidence is greater than critical angle , total internal reflection is taking place at B.
Hence light ray is reflected at B with angle of reflection 60o .
As can be seen from figure , reflected light ray makes normal incidence at C on third side of prism .
Hence the light ray emerges out of the prism by making angle 90o with the third side of prism.
Conclusion :-
If light ray makes normal incidence at one side , then it emerges out from third side by making 90o with third side .
Overall deviation is 60o
Answered by Thiyagarajan K | 19 Jun, 2021, 09:24: AM
Concept Videos
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Refraction of Light at Plane Surfaces
Refraction of Light at Plane Surfaces, Total Internal Reflection
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