Definitions [4]
Define Regular reflection.
The phenomenon due to which a parallel beam of light traveling through a certain medium, on striking some polished surface, bounces off from it, as a parallel beam, in some other direction, is called regular reflection.
Define the term Principle axis.
The principal axis is the straight line passing through the pole and the centre of curvature.
Define reflection.
The bouncing of light by any smooth or polished surface is called.
Definition: Reflection of Light
The phenomenon of bouncing back of light rays in the same medium on striking a surface is called reflection of light.
Formulae [1]
Formula: Number of Images in Inclined Mirrors
n = \[\frac {360°}{θ}\]
- If n is even → N = n − 1
- If n is odd → N = n (object not on bisector); N = n − 1 (object on bisector)
- If n is a fraction → N = integral part of n
Theorems and Laws [1]
Law: Laws of Reflection
- The angle of incidence ∠i = angle of reflection ∠r.
- The incident ray, reflected ray, and normal lie in one plane; both rays are on either side of the normal.
Key Points
Key Points: Reflection of Light
- Reflection occurs when light bounces off a smooth surface like a mirror, following fixed laws.
- Plane mirrors always form virtual, erect, and same-sized images that are laterally inverted.
- Curved surfaces (like a spoon) act as spherical mirrors, changing the image size and orientation depending on the object's position.
