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KCET2018PhysicsRay Optics

An object is placed at a distance of ( 20 ~cm ) from the pole of a concave mirror of focal length ( 10 ) ( cm ). The distance of the image formed is

Options

  1. A(+20 ~cm )
  2. B( +10 ~cm )
  3. C( -20 ~cm )
  4. D( -10 ~cm )

Correct answer

C. ( -20 ~cm )

Step-by-step solution

Using mirror formula, we have [ 1 f = 1 v + 1 u ] Here, ( u=-20 ~cm ; f=-10 ~cm ). Therefore, ( 1 -10 = 1 v + 1 -20 ) [ 1 v = 1 20 - 1 10 = -1 20 ]

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