What type of mirror is used in the view finder of a motor car?

What type of mirror is used as a rear-view mirror in motors cars and other vehicles and why ?

Which is used in speedometer of a motor car?

What type of mirror do dentists use ?

What kind of mirror is used in the headlight of a car and why?

Convex mirror is used as :

What type of mirror is used in search lights and head lights of vehicles?

What type of mirror is used by the dentists? Why a ray of light does not deviate as a result of refraction through a glass slab?

What type of initiators are used in the cationic and anionic addition polymerisations?