An air bubble in a glass slab with a 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 surface. The thickness (in cm) of the slab is:
1. | \(8\) | 2. | \(10\) |
3. | \(12\) | 4. | \(16\) |
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