A fish rises vertically at 3 cm/s in water of refractive index 4/3. A stationary observer in air views it normally. What apparent speed is observed?

Physics · Geometrical optics · apparent depth and shift due to slab

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A fish rises vertically at 3 cm/s in water of refractive index 4/3. A stationary observer in air views it normally. What apparent speed is observed?

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