Question

Explain the refraction of light through a triangular glass prism using a labelled ray diagram. Hence define the angle of deviation.

Answer 1

• 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.