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KCET2019PhysicsRay Optics

A Point object is moving uniformly towards the pole of a concave mirror of focal length ( 25 ~cm ) along its axis as shown below. The speed of the object is ( 1 ~ms ⁻¹ ). At ( t =0 ), the distance of the object from the mirror is ( 50 ~cm ). The average velocity of theimage formed by the mirror between time ( t=0 ) and ( t=0.25 ~s ) is

Options

  1. Azero
  2. B( 40 ~cm s⁻¹ )
  3. Cinfinity
  4. D( 20 ~cm s⁻¹ )

Correct answer

C. infinity

Step-by-step solution

Focal length =25 ~cm U_ f =25 ~cm V_ f = = V_ f -V_ i t =

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