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Q.

A travelling microscope is focused on a mark on a piece of paper and the scale reading is A. A rectangular block of glass is placed on the paper and the microscope is raised and focused on the mark on paper, then microscope reading is B. The paper is now placed on the block of glass, the reading now is C. The refractive index of the material of the block is

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a

$\frac{C - B}{C - A}$

b

$\frac{C - A}{C - B}$

c

$\frac{C - A}{B - A}$

d

$\frac{C}{C - A}$

answer is B.

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Detailed Solution

$μ = \frac{Real Depth}{Apparent depth}$

$μ = \frac{C - A}{C - B}$

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A travelling microscope is focused on a mark on a piece of paper and the scale reading is A. A rectangular block of glass is placed on the paper and the microscope is raised and focused on the mark on paper, then microscope reading is B. The paper is now placed on the block of glass, the reading now is C. The refractive index of the material of the block is