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Solution


Q.

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               [2016]
1 8  
2 10  
3 12  
4 16  

Ans.

(3)

Here μ=1.5

l= length of the slab

x= position of air bubble from one side

As per question, total apparent length of slab = 5 + 3

or xμ+(l-x)μ=8  or  lμ=8             ∴   l=8μ=8×1.5=12 cm