Question

Write relation between focal length and radius of curvature

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

Answer 2

$\bf \Large \underline \blue{Answer}$

• 2f = R

• The focal length (f) of a lens is the distance between the center of the lens and the point at which the reflected light, of a beam of light travelling parallel to the center line, meets the center line (principal axis).

• The radius of curvature (r) is the radius of the lens that forms a complete sphere.