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Question : 22
Total: 36
(a) Define the following terms in the context of spherical mirrors :
(i) Pole
(ii) Centre of curvature
(iii) Principal axis
(iv) Principal focus
(b) Draw ray diagrams to show the principal focus of a :
(i) Concave mirror
(ii) Convex mirror
(c) Consider the following diagram in whichM P Q M Q
(i) Pole
(ii) Centre of curvature
(iii) Principal axis
(iv) Principal focus
(b) Draw ray diagrams to show the principal focus of a :
(i) Concave mirror
(ii) Convex mirror
(c) Consider the following diagram in which
State the type of the mirror
Solution:
(a) (i) Pole is the centre of the reflecting surface of the mirror.
(ii) Centre of curvature is the centre of the hollow sphere of which the reflecting surface of mirror is a part.
(iii) Principal axis is the straight line passing through the pole and the centre of curvature of a spherical mirror.
(iv) Principal focus: 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 of a spherical mirror.M
(ii) Centre of curvature is the centre of the hollow sphere of which the reflecting surface of mirror is a part.
(iii) Principal axis is the straight line passing through the pole and the centre of curvature of a spherical mirror.
(iv) Principal focus: 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 of a spherical mirror.
(c)
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