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

Question

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

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Amity 2 months 2021-08-03T16:43:15+00:00 2 Answers 2 views 0

Answers ( )

    0
    2021-08-03T16:44:48+00:00

    Focal length = 10 cm.

    Solution :

    Given radius of curvature = 20 cm.

    Formula :

    Focal length = Radius of curvature/2

    → Focal length = 20/2

    → Focal length = 10 cm.

    Answer : 10 cm.

    0
    2021-08-03T16:44:53+00:00

    Answer:

     \boxed{\sf Focal \ length = 10 \ cm}

    Given:

    Radius of curvature (R) of a spherical mirror = 20

    To Find:

    Focal length (f)

    Explanation:

    Formula:

     \boxed{ \bold{\sf Focal \ length \ (f) = \frac{Radius \ of \ curvature \ (R)}{2}}}

    Substituting value of R in the equation:

     \sf \implies f =  \frac{20}{2}

     \sf \implies f = \frac{ \cancel{2} \times 10}{ \cancel{2}}

     \sf \implies f = 10 \: cm

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