Chapter 35331P35.42(a)sinsinθθ2121=vvandθ290 0=°.at the critical anglesin.sin90 01 850343°=θcm sm ssoθc==°−sin..10 18510 7af.(b)Sound can be totally reflected if it is traveling in the medium where it travels slower: air.(c)Sound in air falling on the wall from most directions is 100% reflected, so the wall is agood mirror.P35.43For plastic with index of refraction n≥1 42.surrounded by air, the critical angle for total internalreflection is given byθcn=FHGIKJ≤FHGIKJ=°−−sinsin..11111 4244 8 .In the gasoline gauge, skylight from above travels down the plastic. The rays close to the vertical aretotally reflected from the sides of the slab and from both facets at the lower end of the plastic, whereit is not immersed in gasoline. This light returns up inside the plastic and makes it look bright.Where the plastic is immersed in gasoline, with index of refraction about 1.50, total internalreflection should not happen. The light passes out of the lower end of the plastic with little reflected,
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Snell's Law, Sin, Total internal reflection, Fresnel equations