Question

write the relation between focal length and radius​

Answer 1

Answer:

The relation between focal length (f) and radius of curvature (R) of a spherical mirror is that the focal length is equal to half of the radius of curvature i.e. f=R2. ... We know that rays of light parallel to the principal axis passing through the focus (F) of a concave mirror, after reflection.

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Answer 2

The relation between focal length (f) and radius of curvature (R) of a spherical mirror is that the focal length is equal to half of the radius of curvature i.e. f=R2. ... We know that rays of light parallel to the principal axis passing through the focus (F) of a concave mirror, after reflection