Question

In the study of the spectrum ,the prism is placed in minimum deviation position to make the spectrum
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Answer 1

Answer:

The angle of deviation is minimum when the path of light ray through the prism is symmetrical. i.e., angle of incidence = angle of emergence and path of ray within the prism is parallel to the base of the prism.

Answer 2

Answer:

The prism is placed in the minimum deviation position to make the spectrum because :

• the angle of deviation is minimum when the path through which the light ray travels is symmetrical.

• hence the angle of incidence will be equal to the angle of emergence and hence the path of that ray within the prism

• As a result the path of the ray that is emerged is then parallel to the base of the prism.

Prism :

• It is defined as a polyhedron with two polygonal faces that are lying in the parallel planes along with the other faces of the parallelogram.

• It is also a kind of transparent body which is bounded by planes that are non parallel and hence it is used to disperse the beam of the light through the prism

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