Answer to Question #284531 in Optics for luna

Question #284531

The beam of parallel light rays falls onto the surface of water under the angle

60°

. The width of the beam in the air is 10 cm. Find the width of the beam in the water.

Expert's answer

"n=\\frac{\\sin\\alpha}{\\sin\\beta},\\implies \\beta=40.5\u00b0,"

"b=\\frac{a\\cos\\beta}{\\cos\\alpha}=15.2~cm."

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