Chapter 35335P35.54Light passing the top of the pole makes an angle of incidenceφθ190 0=°−.. It falls on the water surface at distance from the polesLd1=−tanθand has an angle of refractionφ2from 1 0012.sinsinφφ=n.Thensd22=tanand the whole shadow length isssdn11+=−+FHGIKJFHGIKJ−tantan sinsindn1120040 040 0133379−+FHGIKJFHGIKJ=°+°FHGIKJFHGIKJ=−−tantan sincos.tan..tansincos...mm mafFIG. P35.54P35.55As the beam enters the slab,1005001482in.in°=giving231 2..FIG. P35.55The beam then strikes the top of the slab at x115531 2=°.tan.mmfrom the left end. Thereafter, the beamstrikes a face each time it has traveled a distance of 21xalong the length of the slab. Since the slab is420 mm long, the beam has an additional 4201mm−xto travel after the first reflection. The numberof additional reflections is420231231081 511mm420 mmmmmm−=−°°=xxan.an..or 81 reflectionssince the answer must be an integer. The total number of reflections made in the slab is then
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .