Question

Some telephoto cameras use a mirror rather than a lens. what radius of curvature mirror is needed to replace a 800 mm-focal length telephoto lens?

Answer 1

R= 1.6 m

Step-by-step explanation:

The radius of curvature of mirror and focal length is given by

R=2f

where R is the radius of curvature

f is the focal length

As the telephoto camera uses mirror instead of lens , we can calculate the radius of curvature of mirror which has focal length of 0.8m which is same as that of lens.

The radius of curvature of mirror is R =2*0.8

R= 1.6 m