JEE MAIN - Physics (2025 - 3rd April Morning Shift - No. 8)
Consider following statements for refraction of light through prism, when angle of deviation is minimum.
A. The refracted ray inside prism becomes parallel to the base.
B. Larger angle prisms provide smaller angle of minimum deviation.
C. Angle of incidence and angle of emergence becomes equal.
D. There are always two sets of angle of incidence for which deviation will be same except at minimum deviation setting.
E. Angle of refraction becomes double of prism angle.
Choose the correct answer from the options given below :
Explanation
When light is refracted through a prism and the angle of deviation is at its minimum, the following occurs:
The refracted ray inside the prism is parallel to the base of the prism.
The angle of incidence and the angle of emergence are equal.
There are two sets of angles of incidence that result in the same angle of deviation, except when the deviation is at its minimum.
These points are illustrated by the equation:
$ \delta = \mathrm{I} + \mathrm{e} - \mathrm{A} $
For the minimum angle of deviation ($\delta_{\text{min}}$), the condition $\mathrm{I} = \mathrm{e}$ is met, and the refracted ray becomes parallel to the base. Thus, statements A, C, and D are correct.
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