Question
Explain the refraction of light through a triangular glass prism using a labelled ray diagram. Hence define the angle of deviation.
✓
Answer
The light ray PE enters from air to glass (rarer to denser medium) at surface AB and therefore, bends towards the normal. The refracted ray EF now exits from glass and enters air (from denser to rarer medium) and therefore, bends away from the normal. Extrapolation of incident and emergent ray gives the angle of deviation.
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