Medium
$A$ glass cube of length $21 \ cm$ has a small air bubble trapped inside. When viewed normally from one face,its apparent distance is $8 \ cm$. When viewed normally from the opposite face,its apparent distance is $6 \ cm$. The refractive index of the glass and the actual distance of the air bubble from the first surface respectively are:
- A$1.5, 12 \ cm$
- B$1.55, 14 \ cm$
- C$1.6, 11 \ cm$
- D$1.5, 9 \ cm$
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