Define the following terms in the context of
spherical mirrors:
(i) Pole
(ii) Centre of curvature
(iii) Principal axis
(iv) Principal focus
Answers
Answer:
Pole :- a point where principal axis Pierce is the mirror is known as pole
centre of curvature:-The Center of Curvature of a spherical mirror is the point in the centre of the mirror which passes through the curve of the mirror
principal axis:-The principal axis of a spherical mirror is a line going through the center of the mirror that is exactly perpendicular (sometimes said "normal") to the surface of the mirror.
principal focus:-The principal focus of a spherical mirror is a point on the principal axis of the spherical mirror at which, the light rays which are parallel to the principal axis actually converge (meet) or appear to diverge after reflection
Answer:
Pole : The centre of the reflecting surface of the mirror is called pole.
Centre of curvature : The centre of the hollow sphere of which the reflecting surface of mirror forms a part is called centre of curvature.
Principal axis : The imaginary line passing through the pole and the centre of curvature of a spherical mirror is called principal axis.
Principal focus : When incident rays parallel to principal axis, after reflection, either converge to or appear to diverge from a fixed point on the principal axis called principal focus.