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NEET 2006
Exam
NEET
Year
2006
Subject
Physics
Chapter
Ray Optics

NEET 2006 · Physics · Ray Optics

A microscope is focussed on a mark on a piece of paper and then a...

A microscope is focussed on a mark on a piece of paper and then a slab of glass of thickness 3 cm3 \mathrm{~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 cm2 \mathrm{~cm} upward
  2. B1 cm1 \mathrm{~cm} upward
  3. C4.5 cm4.5 \mathrm{~cm} downward
  4. D1 cm1 \mathrm{~cm} downward

Correct answer

B. 1 cm1 \mathrm{~cm} upward

Step-by-step solution

=t(1−14)=3(1−11⋅5)=1 cm=t\left(1-\frac{1}{4}\right)=3\left(1-\frac{1}{1 \cdot 5}\right)=1 \mathrm{~cm}
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