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Q.

Give definitions for the following concepts in relation to spherical mirrors: 

(i) Pole 

(ii) Centre of curvature 

(iii) Principal axis 

(iv) Principal focus

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Detailed Solution

Centre of curvature: It is the centre of the sphere of a glass of which the mirror is a part. The letter 𝐶 represents the centre of curvature. 

The principal axis of a spherical mirror is the straight line joining the centre of curvature and the pole of the mirror. 

Principal focus: The midpoint of 𝐶𝑃 is called focus (𝐹). 

The pole of a spherical mirror is the centre of the reflecting surface of the spherical mirror.

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