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Q.

The distance between the principal focus and the pole of a spherical mirror is called: 

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a

Focal length

b

Radius of curvature

c

Principal length

d

Principal axis

answer is D.

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Detailed Solution

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  • When parallel rays are incident on a spherical mirror, they meet or appear to meet at the principal focus after reflection.
  • The distance between the principal focus and the pole of the mirror is called the focal length of the mirror.

Therefore, focal length is the correct answer.

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