What is reflection of light ,what is a mirror ,plane mirror and spherical mirror

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https://youtu.be/_G9AlY0OdrY

When a ray of light return back after striking a surface this is  called reflection of light .
Laws of reflection
1-Incident ray ,reflected ray and point of incident exit in same surface .
2-Angle of incidence is equal to angle of reflection i.e  i=r .
These laws of reflection are applicable to all types of reflecting surfaces including  plane and spherical surfaces .
Mirror is an optical instrument by which we see or obtain image of a object .It is based on the principle of  reflection of light .
Note - Opposite surface of a mirror is coated by silver and red paint .  
Plane mirror that mirror whose reflecting surface is plane .
Some important points related to a plane mirror
1) when an object moves with V m/s towards a plane mirror image velocity will be 2V m/s
2)The length of a plane mirror  should be  half length of a man to viewing his full image .
3)When a plane mirror rotated through thita angle ,the reflected ray moves through 2thita .
4)Number of image between two plane mirror is equal to 360/thita -1
Where ,thita is the angle between mirrors .
image made by a plane mirror
SPHERICAL MIRROR 
The reflecting surface of a spherical mirror may be curved inwards or outwards .A sherical mirror whose reflecting surface is  curved inwards that is face towards the centre of the sphere ,is called CONCAVE MIRROR 
A sherical mirror whose reflecting surface is curved outwards is called CONVEX MIRROR

Important points related to a spherical mirror
1)principle axis -  an imaginary axis passes through the mean of an spherical mirror .


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