For an apparent depth of swimming pool seen from above (real depth d, water n = 4/3):
A2d
Bd / n²
Cd × n = 4d/3
Dd / n = 3d/4
Answer & Solution
Correct answer: D. d / n = 3d/4
Apparent depth = real depth / n. A 4 m pool appears 3 m deep when viewed straight down. (Reason: refraction at water-air interface bends light.)
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