An air bubble in a glass with refractive index 1.5 (near normal incidence) i.e. 5cm deep when viewed from one surface and 3cm deep when viewed from the opposite face. The thickness(in cm) of the is.
12
16
8
10
A
16
B
8
C
10
D
12
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Solution
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The apparent dept of bubble as seen from one surface=d1μ=5cm
⟹ Real depth of bubble from one surface d1=7.5cm
Similarly real depth of bubble from other surface=d2=1.5×3cm=4.5cm
Hence the thickness of the glass is d1+d2=12cm
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