Question

what are the two conditions for minimum deviation? Explain how.​

Answer 1

Answer---»»➷

◇ Conditions:-

★ Light is deflected as it enters a material with refractive index .

★ A ray of light is deflected twice in a prism. The sum of these deflection is the deviation angle.

★ When the entrance and exit angles are equal, the deviation angle of a ray passing through a prism will be a minimum.

◇ Explanation:-

■ Because refractive index of the prism: The refractive index depends on the material and the wavelength of the light. The larger the refractive index, the larger the deviation angle.

■» Angle of prism:- The larger the prism angle, the larger the deviation angle.

■ Angle of incidence:- The deviation angle depends on the angle that the beam enters the object, called angle of incidence. The deviation angle first increases with increasing incidence angle, and then it decreases.

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Answer 2

deviation can be minimum if angle of incidence is equal to angle of emergence