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  5. Light - Reflection and Refraction

10th Class Science Light - Reflection and Refraction Question Bank Light - Reflection and Refraction

  • question_answer
    An object is placed at the centre of the curvature of a concave mirror. What is the distance between its image and the pole?

    A) Equal to f

    B) Between f and 2 f

    C) Equal to 2 f

    D) Greater than 2 f

    Correct Answer: C

    Solution :

    An object is placed at C, \[\therefore \] \[u=-C=-2f\] Mirror formula, \[\frac{1}{f}=\frac{1}{u}+\frac{1}{v}\] For concave mirror, f = negative                 \[-\frac{1}{f}=\frac{-1}{2f}+\frac{1}{v},\frac{1}{v}=-\frac{1}{f}+\frac{1}{2f}\]                 \[\frac{1}{v}=\frac{-1}{2f}\Rightarrow v=-2f\]


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