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PRACTICE · MEMBERSIntermediate · Single correct

PRACTICE / Snell law

A coin looks closer to the surface

A coin lies 0.24 m below a flat water surface. Water has refractive index 4/3 relative to air. View nearly normally from air.

Find its apparent depth.

Organize the givens & assumptions
  • real depth = 0.24 m
  • nwater/nair = 4/3

Flat water-air surface, near-normal viewing from air and a point object in water; index ratio 4/3.

  1. A0.06 m0.06\ \mathrm m
  2. B0.18 m0.18\ \mathrm m
  3. C0.32 m0.32\ \mathrm m
  4. D0.24 m0.24\ \mathrm m

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