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KVPY2015PhysicsRay Optics

An optical device is constructed by fixing three identical convex lenses of focal lengths 10 ~cm each inside a hollow tube at equal spacing of 30 ~cm each. One end of the device is placed 10 ~cm away from a point source. How much does the image shift when the device is moved away from the source by another 10 ~cm ?

Options

  1. A0
  2. B5 ~cm
  3. C15 ~cm
  4. D45 ~cm

Correct answer

A. 0

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