Question

In an equilateral prism, the path of refracted ray of light in the prism is parallel to base of prism when the

• A. ray undergoes maximum deviation
• B. ray is incident at critical angle
• C. ray is of particular wavelength
• D. ray undergoes minimum deviation

Answer 1

The correct option is D ray undergoes minimum deviation

In an equilateral prism, when the ray passes parallel to the base, the angle of incidence of the ray on both sides is same. Therefore, minimum deviation is achieved.