Answer:
The refraction of light through a
triangular glass prism is shown below
A ray of light PE is entering
from air to glass at the first surface AB. The light ray EF on refraction has
bent towards the normal. At the second surface AC, the light ray FS has entered
from glass to air and bent away from normal.
The angle made by extending
incident ray with the emergent ray is called angle of deviation.
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