Incident ray, normal at the point of incidence and refracted ray are always

Correct option is D

Correct Answer: D. Coplanar

• According to the laws of refraction (Snell’s Law), the incident ray, normal at the point of incidence, and the refracted ray all lie in the same plane.

• This plane is called the plane of incidence.

• Being coplanar means they all lie on one flat surface or geometric plane.

• They are not necessarily perpendicular (Option A) or parallel (Option C).

• Their angles can be acute or obtuse, depending on the media (Option B is incorrect as a general rule).

• This fundamental principle is true for both reflection and refraction.