what is focal length
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Focal length is the distance between the centre of a lens or curved mirror and its focus.
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the distance between pole and principal focus of a spherical mirror is called its focal 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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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.
i hope this will help you
if helpful then please select my answer as brainliest answer
and also follow me ❤️❤️❤️❤️❤️❤️❤️❤️
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