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# An air bubbles in glass slab of refractive index =1.5 from one side is 6cm,amd other side is 4cm.the thickness of glass slab is? A-10cm,B-6.67cm,C-15cm,D-none

Asked by Priyanka 15th November 2017, 9:23 AM
From the given figure we can write  ( real-depth / apparent-depth ) = refractive index = 1.5
hence real depth is 1.5 times of apparent depth. If from one side, bubble is visible at 6 cm depth then the real depth is 9.
Similarly from other side if the bubble is visible at depth 4 cm, then real depth is 6 cm.
Hence the thickness of glass slab is 9+6 = 15 cm. Option (c) is correct.
Answered by Expert 15th November 2017, 1:25 PM
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