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AP Physics 2
13.3 Refraction
IntermediateMCQConceptual13.3k
A cross-sectional schematic showing a rectangular container with a flat bottom and vertical walls. The lower two-thirds of the container is filled with water, indicated by a horizontal line representing the water surface labeled Water surface. The region below the line is labeled Water (n > 1) and the region above is labeled Air (n = 1). A small shaded rectangular disk labeled Coin rests horizontally at the center of the bottom floor. A dashed vertical line extends upward from the coin through the water surface into the air. An observer eye symbol is positioned above the water surface in the upper right, oriented looking diagonally downward toward the point where the dashed vertical line crosses the water surface. No other labels, lines, text, or axes appear.
A coin resting at the bottom of a water basin viewed by an observer in air.
A small coin rests at the bottom of a basin filled with still water of refractive index \(n > 1\). An observer standing beside the basin looks downward into the water from the air and observes that the coin appears to be located at a shallower depth than its actual physical position. Which of the following explanations correctly accounts for why the coin appears elevated?

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