Some examples from this set of practice questions
1.
Define Pole
Answer: It is the mid-point of it\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'s reflecting surface
2.
Define centre of curvature
Answer: Centre of that imaginary sphere of which, mirror is part
3.
Principal axis
Answer: A line joining pole and center of curvature
4.
Aperture
Answer: Diameter of reflecting surface of spherical mirror
5.
Focus
Answer: A point on principle axis of the spherical mirror at which the light rays coming parallel to principle focus which is denoted by F
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