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This lecture covers the correction of exercise 1 from series 15, focusing on a system with water, oil, and air layers. It explains how to determine if the apparent depth of the system is larger or smaller than the actual depth by analyzing the refraction of light rays at different interfaces. Through trigonometric calculations and the Snell-Descartes law, the apparent depth is expressed as a function of angles and layer properties, leading to a numerical application that shows the apparent depth is smaller than the real depth.