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  1. The focal length of a concave mirror with a radius of curvature of 20.0 cm is :

    2. A.

     20 cm
    B.

     5 cm
    C.

     10 cm
    D.

     15 cm

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    Answer : Option C

    Explanation :

    Let us assume f is focal length
    R is radius of curvature
    According to the formula R = 2f
    f = R/2
    = 20/2
    = 10 cm

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