Question

A ray of light is incident on one of the refracting face of the prism. It emerges out from its o
side making an angle of emergence
a) Smaller than the angle of incidence
c) Equal to angle of incidence
b) equal to prism angle
d) greater than angle of incidence
plz plz plz be fast​

Answer 1

A ray of light is incident on one of the refracting faces of the prism and it emerges out from its side making an angle of emergence equal to the angle of incidence.

• The angle between the incident ray produced forward and the emergent ray produced backward is called the 'angle of deviation'.
• For one, and only one, particular angle of incidence the prism produces minimum deviation.
• If the path of the ray is reversed, the angle of incidence and the angle of emergence will have their respective values.
• But the deviation can be minimum for only one value.
• So, by this, it is clear and proved that the angle of incidence is equal to the angle of emergence.