Question

radius of curvature of spherical mirror is 20 CM .a type of mirror is__​

Answer 1

Radius of curvature of a spherical mirror = 2 — Focal length (f)

R= 2f

f= R/2

f = 20 / 2

f = 10

Hence, the focal length of the given spherical mirror is 10 cm

Answer 2

Answer:

Focal length = R/2 = 20/2 = 10

So, here focal length is +ve.

And we know that,

According to the sign convention,

Focal length of concave mirror is -ve.

And that of the convex mirror is +ve.

So, the type of mirror is convex mirror.