17. An air bubble in a glass slab (μ = 1.5) is 5 cm deep when viewed from one face and 2 cm deep when viewed from the opposite face. The thickness of the slab is ?
(a) 7.5 cm
(b) 10.5 cm
(c) 7 cm
(d) 10 cm
Answer : (b) 10.5 cm
\( t = x + y \)
\( = 5\mu + 2\mu \)
\( = 7\mu \)
\( = 7 \times 1.5 \)
\( = 10.5 \)
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