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JEE Main202331 Jan 2023Evening ShiftPhysicsRay OpticsActual

A microscope is focused on an object at the bottom of a bucket. If liquid with refractive index 5 3 is poured inside the bucket, then microscope have to be raised by 30 cm to focus the object again. The height of the liquid in the bucket is :

Options

  1. A75 cm
  2. B50 cm
  3. C18 cm
  4. D12 cm

Correct answer

A. 75 cm

Step-by-step solution

In this case shift is given by, shift = d 1 - 1 μ = 30   cm ⇒ d 1 - 1 5 3 = 30 ⇒ d = 30 × 5 2 = 75   cm

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