Question

How will the angle of incidence relate to the angle of reflection?

Answer 1

Hint: The incident angle can be defined as the angle between a ray incident on a surface and the line perpendicular to the surface of incidence which is called the normal. The angle of reflection is described as the angle between a ray reflected from a surface and the line perpendicular to it, the normal.

Complete step-by-step answer:
When light is reflected from a specific surface, the angle of incidence is always the same as the angle of reflection, where the both angles are calculated from the path of the light to the normal to the surface at the point at which light strikes the surface. This equality is called the law of reflection.
That is,
Angle of incidence is equivalent to angle of reflection
$\mathrm{\angle }i=\mathrm{\angle }r$
Where i is the angle of incidence and the r is the angle of reflection.
Hence the answer for the question is obtained.

Note: Fermat's principle, also called as the principle of least time, is the link in between ray optics and the wave optics. Fermat's principle states that the path occupied by a ray between two particular points is the same as the path that can be traversed in the least time. The Snell’s law states that, a ray which is being hit on the interface of the two media, the sine of the angle of incidence times the index of refraction of the first medium is equivalent to the sine of the angle of refraction times the index of refraction of the another medium. These laws are useful in calculating the angle of incidence and refraction.