PHY2049: Chapter 331Four pairs of polarizing sheets are placed in the path of initially unpolarized light, with the polarizing direction of each sheet indicated by the dashed line. Ranks the pairs according to the fraction of the initial intensity that they pass.CHECKPOINT 4 (page 904)PHY2049: Chapter 332(continued)A: b > c > d > a B: a > d > b > cC: c > b > d > aD: d > c > b > aE: a > b > d > cPHY2049: Chapter 333• Initially unpolarized light is sent into a set of three polarizing sheets, either a or b. Which set lets more light through?(a)45°45°(b)a (b completely blocks light.)• What fraction of the light’s initial intensity is transmitted?1/8Quiz0°0°90°90°PHY2049: Chapter 334Light travels from a medium whose index of refraction is n1into another medium whose index of refraction n2. In which of the two cases is n2larger than n1?(b)(a)aCHECKPOINTPHY2049: Chapter 335White lightPrisms have double reflections and limited resolution. To study a light spectrum, diffraction gratings (see Chapter 36) are used instead of prisms. See a demo in the lobby.RedVioletChromatic dispersionPHY2049: Chapter 336n2n1For a total reflection to occur, n1 has to be larger than n2.Total Internal ReflectionPHY2049: Chapter 337A point source of light is located 3 m below the body of water. Find the diameter of the circle at the surface through which light emerges from the water.θ = 48.8° 2r= 6.84 mradiusn2 ≈ 1n1 =
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