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A vertical opaque stem is partially planted in water. A light source illuminates the stem, creating a shadow of length L = 20 cm at

A vertical opaque stem is partially planted in water. A light source illuminates the stem, creating a shadow of length L = 20 cm at the bottom of the water. We give that h, = 20 cm and h, = 30 cm. What is the angle of incidence ?

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