CBSE Class 10 Science 2016 Term II Delhi Set 1
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Question : 22 of 36
Marks:
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(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 which is a mirror and is an object and is its magnified image formed by the mirror.
(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 is a mirror and is an object and is its magnified image formed by the mirror.
State the type of the mirror and one characteristic property of the image .
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.
(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) is a concave mirror and the image is virtual.
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