Ray Optics: Apparent Depth — Multiple Layers MCQ

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Apparent Depth — Multiple LayersHardQuestion 20240

Question

A fish in water (n=4/3) at depth 18 cm below a 6 cm thick glass (n=3/2) layer. Total apparent depth seen from air:

13.5 cm + 4 cm = 17.5 cm

For the glass layer: apparent depth = 6/(3/2) = 4 cm. For the water layer: apparent depth = 18/(4/3) = 13.5 cm. Total = 13.5 + 4 = 17.5 cm.