Question

Write the relationship between focal length and radius of curvature

Answer 1

Write down the relationship betweenthe focal length and the radius of curvature of a spherical mirror and prove it. Answer: The relationship between the focal length f and radius of curvature r is r = 2f. Consider a ray of light AB, parallel to the principal axis and incident on a spherical mirror atpoint B.

Answer 2

If a spherical mirror has a large aperture, it does not have a single focus. Instead, it has a curve of foci, forming what is known as a caustic curve. The conventional focus is one point on the curve.