Question

At the interface of two transparent mediums at the point of incidence, the incident ray, the refracted ray and the normal all lie in_____

• A. Different plane
• B. Same plane
• C. Depends on the medium
• D. Insufficient data

Answer 1

The correct option is B

Same plane

The incident ray, refracted ray and normal lie on the same plane. This is one of the results of Snell's law i.e. the first law of refraction. Snell's law states that the ratio of the sines of the angles of incidence and refraction is equivalent to the ratio of phase velocities in the two media, or equivalent to the reciprocal of the ratio of the indices of refraction.