Question

The radius of curvature of a spherical mirror is 20 cm find out its focal length

Answer 1

Answer:

Spherical mirror are of two types :-

for convex mirror

focal length (f) = R/2 (+ve)

Radius = 20

a.t.q

f = R/2

f= 20/2

f=10

For concave mirror

focal length (f) = R/2 (-ve)

Radius =20

a.t.q

f= R/2

f = -20/ 2

f = -10

Answer 2

HEY FRIEND HERE IS UR ANSWER ,

Radius of curvature (R) = 20 cm

Radius of curvature of the spherical mirror = 2 × Focal length (f) R = 2f

f= R/2 = 20 / 2 = 10

Therefore, the focal length of the spherical mirror is 10 cm.

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