Multiple Choice Questions on The radius of curvature of a mirror is 20cm the focal length is ........ for 10th Standard Preparation

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Multiple Choice Questions

The radius of curvature of a mirror is 20cm the focal length is ........

Physics Chapter - 10
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    The radius of curvature of a mirror is 20cm the focal length is

    20cm

    Incorrect Answer

    10cm

    Correct Answer

    40cm

    Incorrect Answer

    5cm

    Incorrect Answer
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    Explanation:

    The focal length of a 'spherical mirror' is half of its 'radius of curvature.' f=\frac{r}{2} \rightarrow(1). Where f is the 'focal length', r is 

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