78 E The primary rainbow described in Problem 77 is the type commonly seen in regions where rainbows appear. It is pro- duced by light reflecting once inside the drops. Rarer is the sec- ondary rainbow described in Module 33-5, produced by light reflecting twice inside the drops (Fig. 33-68a). (a) Show that the angular deviation of light entering and then leaving a spherical water drop is Odev = (180°)k + 20, – 2(k + 1)8,, where k is the number of internal reflections. Using the procedure of Problem 77, find the angle of minimum deviation for (b) red light and (c) blue light in a secondary rainbow. (d) What is the angular width of that rainbow (Fig. 33-21d)? The tertiary rainbow depends on three internal reflections (Fig. 33-68b). It probably occurs but, as noted in Module 33-5, cannot be seen with the eye because it is very faint and lies in the bright sky surrounding the Sun. What is the angle of minimum de- viation for (e) the red light and (f) the blue light in this rainbow? (g) What is the rainbow's angular width? (a) (6)

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Chapter1: Units, Trigonometry. And Vectors
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78 E The primary rainbow described in Problem 77 is the
type commonly seen in regions where rainbows appear. It is pro-
duced by light reflecting once inside the drops. Rarer is the sec-
ondary rainbow described in Module 33-5, produced by light
reflecting twice inside the drops (Fig. 33-68a). (a) Show that the
angular deviation of light entering and then leaving a spherical
water drop is
Odev = (180°)k + 20, – 2(k + 1)8,,
where k is the number of internal reflections. Using the procedure
of Problem 77, find the angle of minimum deviation for (b) red
light and (c) blue light in a secondary rainbow. (d) What is the
angular width of that rainbow (Fig. 33-21d)?
The tertiary rainbow depends on three internal reflections
(Fig. 33-68b). It probably occurs but, as noted in Module 33-5,
cannot be seen with the eye because it is very faint and lies in the
bright sky surrounding the Sun. What is the angle of minimum de-
viation for (e) the red light and (f) the blue light in this rainbow?
(g) What is the rainbow's angular width?
(a)
(6)
Transcribed Image Text:78 E The primary rainbow described in Problem 77 is the type commonly seen in regions where rainbows appear. It is pro- duced by light reflecting once inside the drops. Rarer is the sec- ondary rainbow described in Module 33-5, produced by light reflecting twice inside the drops (Fig. 33-68a). (a) Show that the angular deviation of light entering and then leaving a spherical water drop is Odev = (180°)k + 20, – 2(k + 1)8,, where k is the number of internal reflections. Using the procedure of Problem 77, find the angle of minimum deviation for (b) red light and (c) blue light in a secondary rainbow. (d) What is the angular width of that rainbow (Fig. 33-21d)? The tertiary rainbow depends on three internal reflections (Fig. 33-68b). It probably occurs but, as noted in Module 33-5, cannot be seen with the eye because it is very faint and lies in the bright sky surrounding the Sun. What is the angle of minimum de- viation for (e) the red light and (f) the blue light in this rainbow? (g) What is the rainbow's angular width? (a) (6)
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