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JEE Main 2016 (10 Apr, Shift 1) · Refraction, Glass Slab & Apparent Depth

Refraction, Glass Slab & Apparent Depth question from JEE Main 2016 (10 Apr, Shift 1)

Q70JEE Main 2016 · 10 APR · SHIFT 1Easy

Refraction, Glass Slab & Apparent Depth

To determine refractive index of glass slab using a travelling microscope, minimum number of readings required are:

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Answer: (b)

Reading 1: mark without slab; reading 2: mark seen through slab; reading 3: top surface of slab.
Real thickness = $R_3 - R_1$ , apparent thickness = $R_3 - R_2$ , $\mu = \frac{R_3 - R_1}{R_3 - R_2}$ .
So the answer is (b) Three.

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