Question

The angle of minimum deviation of a ray passing through a glass prism is least for which light color?​

Answer 1

Answer:

Red color deviates through minimum deviation of a ray passing through a glass prism.

Hope it helps you!

Answer 2

Answer is Red.

Explanation:

The prism formula is,

μ=sin(A+δm2)sin(A2), where,

μ is the refractive index of the material of the prism,

A is the refracting angle of the prism,

and δm is the angle of minimum deviation.

⇒δm=2arcsin(μsin(A2))−A.

⇒ For a given refracting angle of the prism, the angle of minimum deviation increases or decreases with an increase or decrease in the refractive index of the material of the prism since A+δm<180o.

⇒ The colour for which the angle of deviation is the minimum is that for which the refractive index is minimum.

We know that the refractive index of the material of the prism increases or decreases with an increase or decrease in the frequency of the electro-magnetic radiation passing through it.

⇒ The colour for which the angle of deviation is the minimum is that for which the wave length is maximum.

⇒ The angle of deviation is minimum for red and maximum for violet in the visible spectrum.