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The radius of curvature of a given spherical mirror is-20 cm. The focal length of the mirror is?

A-10 cm

B40 cm

C10 cm

D-40 cm

Answer:

A. -10 cm

Read Explanation:

  • The focal length (f) of a spherical mirror is half of its radius of curvature (R).

  • The formula is: f = R/2.

  • Given R = -20 cm

  • therefore f = -20 cm / 2 = -10 cm.

Related Questions:

An optical device Y has positive focal length. Y is?
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If a ray of light is incident passing through the center of curvature of a concave mirror, then the angle between the incident ray and the reflected ray will be equal to?
The distance between the focus and the center of curvature of a spherical mirror, in terms of the radius of curvature R, is equal to?

A spherical mirror forms an erect and diminished image. Identify the correct statements about the spherical mirror.

  1. (A) The mirror is concave.
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