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Important terms related to a spherical mirror

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Question

Fill in the blanks :
The distance of the focus from the pole is called the ...................

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Solution

Focal length.
Focal length is the linear distance between the pole and the principal axis.
Focus: (Principal focus) It is a point on the principal axis of the mirror, such that the rays incident on the mirror parallel to the principal axis after reflection, actually meet at this point.

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