i) The radius of curvature of a spherical mirror is 20 cm . What is its focal length?​

2 thoughts on “i) The radius of curvature of a spherical mirror is 20 cm . What is its focal length?​”

1. Answer:

   Radius of curvature (Ⓡ)

   = 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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2. Hence, the focal length of the given spherical mirror is 10 cm.

   Explanation:

   Radius of curvature, R = 20 cm Radius of curvature of a spherical mirror = 2 × Focal length (f)

   R = 2 f

   f = R /2

   = 20 / 2

   = 10

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

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