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.

1
Expert's answer
2022-01-12T08:31:49-0500

n=sinαsinβ,    β=40.5°,n=\frac{\sin\alpha}{\sin\beta},\implies \beta=40.5°,

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


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