Apparent depth =RefractiveindexRealdepthfromsurface
d=(d1+d2)μ
=1.5(5+3)=12cm
NEET UG 2016 — Physics Optics
An air bubble in a glass slab with refractive index 1.5 (near-normal incidence) is 5cm deep when viewed from one surface and 3cm deep when viewed from the opposite face. The thickness (in cm) of the slab is
Held on 30 Apr 2016 · Verified 9 Jul 2026.
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