Correct Answer: Option A

Explanation

For a ray entering and exiting parallel faces of a glass slab, the refractive index is given by:

n = \(\frac{\text{real depth}}{\text{apparent depth}}\)

Where SR = 6cm is apparent depth, SQ = 10cm real depth.

n = \(\frac{10}{6}\) = 1.6666 ≈ 1.67

There is an explanation video available below.

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