PhysicsA concave mirror of a focal length of 20 cm forms an image twice the size of the object. For the virtual position of the image, the position of the object will be at

A concave mirror of a focal length of 20 cm forms an image twice the size of the object. For the virtual position of the image, the position of the object will be at

  1. A

    40 cm

  2. B

    25 cm

  3. C

    10 cm

  4. D

    At infinity

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    Solution:

    For virtual image,

    m=-vu=+2⇒v=-2u

    1u+1v=1f

    ∴  1u+1-2u=1-20

    ⇒  12u=1-20

    ⇒  u=-10 cm

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