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1. Define focal length.
 
The distance between the  and the  is known as the focal length (f) of a spherical mirror.
 
The focal length is  radius of curvature.
    
2. Give any two applications of a concave and convex mirror.
 
Answer variants:
Make-up mirror
Hallway mirror
Rear view mirror
Head lights
 
Concave mirror:
 
a.
 
b.
 
Convex mirror:
  
a.
 
b.
  
3. State the laws of reflection.
 
The laws of reflection are as follows:
 
• The incident ray, the reflected ray and the normal at the point of incidence, .
 
• \(\theta _{i}\)  \(\theta _{r}\)