Question

what is focus length

Answer 1

the distance between pole and principal focus of a spherical mirror is called its focus length.it is represented by f.


if the aperture of the mirror is small,then f=R/2,it means that the principal focus of a spherical mirror lies midway between the pole and centre of curvature.




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Answer 2

the distance between pole and principal focus of a spherical mirror is called its focus length.it is represented by f.

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