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NEET2006PhysicsRay OpticsActual

A microscope is focussed on a mark on a piece of paper and then a slab of glass of thickness 3 ~cm and refractive index 1.5 is placed over the mark. How should the microscope be moved to get the mark in focus again ?

Options

  1. A2 ~cm upward
  2. B1 ~cm upward
  3. C4.5 ~cm downward
  4. D1 ~cm downward

Correct answer

B. 1 ~cm upward

Step-by-step solution

=t (1- 1 4 )=3 (1- 1 1 5 )=1 ~cm

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