Question

The rays, parallel to the principal axis,
of a spherical mirror, actually meet at
a
point 20 cm distant from its pole.
Identify the mirror and give its focal
length
A Convex mirror and f=
20 cm
B Concave mirror and f=
20 cm
C Concave mirror and f=
10 cm​

Answer 1

Answer:

The distance from the pole to the focal point is called the focal length (f). The focal length of a spherical mirror is then approximately half its radius of curvature. It is important to note up front that this is an approximately true relationship