A bird in air descends vertically at 3 cm/s toward water of refractive index 4/3. A stationary fish observes it normally. What apparent speed does the fish measure?
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A bird in air descends vertically at 3 cm/s toward water of refractive index 4/3. A stationary fish observes it normally. What apparent speed does the fish measure?

G1 Physics · Accepted Answer

For an air object viewed from water, vₐ=μv=(4/3)3=4.00 cm/s.