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Explain the refraction of light through a triangular glass prism using a labelled ray diagram. Hence define the angle of deviation.
Answers (1)
Ans.
The refraction of light through a triangular glass prism is shown below
A – Angle of prism
D – Angle of deviation
i – incident angle
r – angle of refraction
e – emergent angle
A ray of light PE enters at the first surface AB (from air to glass).
As light travels from rarer to denser medium, it bends towards the normal.
Hence, EF bends towards the normal.
At the second surface AC, the light enters from denser to rarer medium, so it bends away from the normal.
Hence, FS bends away from the normal.
The angle made by extending incident ray with the emergent ray is called angle of deviation
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