What is the Principal axis?
The straight-line passing through the pole and the centre of curvature of the mirror is called the principal axis.
CH 5. LIGHT
What is the Radius of curvature?
The radius of the sphere of which a mirror is a part is called the radius of curvature.
What is the Centre of curvature?
The centre of the sphere of which the mirror is a part is called the centre of curvature.
Define Pole.
The central point of a mirror is called its Pole.
What is a Concave mirror?
A concave mirror or converging mirror has a reflecting surface that bulges inward.
Define Convex mirror.
A convex mirror, fish eye mirror, or diverging mirror is a curved mirror in which the reflective surface bulges towards the light source.
What happens to the ray of light when it enters from an optically denser medium?
When a ray of light travels from an optically rarer to an optically denser medium it bends towards the normal.
What happens to the ray of light when it enters from an optically rare medium?
When a ray of light travels from an optically rarer medium it bends away from the normal.
Define Refraction.
Refraction is the phenomenon in which a ray of light bends from its straight path at the surface of separation of two media when it travels from one medium to the other.