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

  • question_answer
    Find the position, nature and size of the image formed when an object of size 1 cm is placed at a distance of 15 cm from a concave mirror of focal length 10 cm.

    A) On the left side, 30 cm, real, inverted and magnified

    B) On the left side, 20 cm, virtual, upright and diminished

    C) On the right side, 30 cm, real, inverted and magnified

    D) On the right side, 20 cm, virtual, up- right and diminished

    Correct Answer: A

    Solution :

    \[\frac{1}{v}+\frac{1}{u}=\frac{1}{f},\]we get: \[\frac{1}{v}+\frac{1}{-15}=\frac{1}{-10}\] \[\frac{1}{v}=\frac{+2-3}{30},\frac{1}{v}=\frac{-1}{30}\] So, image distance, v = -30 cm on the left side of the mirror. It is real, inverted and magnified.


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