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NEET 2006 (AIPMT) · Refraction, Glass Slab & Apparent Depth

Refraction, Glass Slab & Apparent Depth question from NEET 2006 (AIPMT)

Q77NEET 2006 · AIPMTEasy

Refraction, Glass Slab & Apparent Depth

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?

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Answer: (b)

  1. The slab raises the mark by t(1−1μ)t\left(1 - \frac{1}{\mu}\right).
  2. =3(1−11.5)=1 cm= 3\left(1 - \frac{1}{1.5}\right) = 1\text{ cm}
  3. The image rises, so the microscope must move up. So the answer is (b) 1 cm upward.
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