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1. What is reflection? Write short notes on regular and irregular reflection?
 
The bouncing back of light into the same medium is called .
 
Incident ray:

An incident ray is a ray of light that .
 
The  is called the incidence angle.
 
Reflected ray:

The reflected ray is the ray of light that .
 
The  is called the reflection angle.
 
The laws of reflection are as follows:
 
• The incident ray, the reflected ray and the normal at the point of incidence, .
 
• \(\theta _{i}\)  \(\theta _{r}\)
 
Regular reflection:
When a beam of light hits on a , it gets reflected. After reflection, the reflected rays will be . This is called regular reflection.
 
Irregular reflection:
When a beam of light hits on a ,  the light rays are reflected . This is called irregular reflection.