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Q.

A monochromatic light passes through a glass slab μg= 1.5 of thickness 9 cm in time t1. If it takes a time t 2 to travel the same distance through water ( μw= 4/ 3). The value of (t1 – t2 ) is

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a

5 × 10–11 sec

b

5 × 10–8 sec

c

2.5 × 10–10 sec

d

5 × 10–10 sec

answer is A.

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Detailed Solution

time to travel through the slab: t=dμc , where d = thickness, μ = Refractive Index, c = speed of light in vacuum

⇒t1-t2=dcμg-μw

=0.093×10832-43=5×10-11 sec

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