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Geometrical Optics question

2006 · Q142
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Geometrical Optics question

2006 · Q142

NEETPhysicsGeometrical OpticsMCQ+4 / −1
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 ?
  1. A
    2 cm upward
  2. B
    1 cm upward
  3. C
    4.5 cm downward
  4. D
    1 cm downward
View written solutionFree

Correct answer: B

Apparent depth = real depthμ{{real\,depth} \over \mu }μrealdepth​ = 31.5{3 \over {1.5}}1.53​ = 2 cm

As image appears to be raised by 1 cm, therefore, microscope must be moved upwards by 1 cm.

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