Question

Radius of curvature of a mirror is 20cm. What type of mirror is it

Answer 1

Answer:

Given:

R=20cm

We know that

R=2f

So,

f=R/2

f=20/2

f=10cm

Hence f is positive so it is convex mirror

Answer 2

Answer:

Concave mirror

Explanation:

Since Radius of Curvature = 20 cm

and     $R = 2 * focal length$

          $F = \frac{R}{2}$

          $F = \frac{20}{2}$

          $F=10 cm$

Since focal length is positive and focal length is positive  for mirrors that converge light rays.

Therefore mirror will be a concave mirror

#SPJ2