An air bubble in a glass slab with refractive index 1.5 \( \mathrm{...

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An air bubble in a glass slab with refractive index 1.5
\( \mathrm{P} \) (near normal incidence) is \( 5 \mathrm{~cm} \) deep when viewed

W from one surface and \( 3 \mathrm{~cm} \) deep when viewed from the opposite face. The thickness (in cm) of the slab is
(a) 8
(b) 10
(c) 12
(d) 16
(NEET)
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