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NEET 2016 (Phase 2) · Refraction, Glass Slab & Apparent Depth

Refraction, Glass Slab & Apparent Depth question from NEET 2016 (Phase 2)

Q71NEET 2016 · PHASE 2Medium

Refraction, Glass Slab & Apparent Depth

An air bubble in a glass slab with refractive index 1.5 (near normal incidence) is 5 cm deep when viewed from one surface and 3 cm deep when viewed from the opposite face. The thickness (in cm) of the slab is

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Answer: (c)

Real depth = $\mu \times$ apparent depth, from each face.
Thickness $= \mu(5 + 3) = 1.5 \times 8$ .
Thickness $= 12$ cm, so the answer is (c).

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