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Fig. 23-CO, p. 790. Fig. 23-1, p. 791. Fig. 23-2, p. 791. Fig. 23-3, p. 791. Fig. 23-4, p. 792. Fig. MCQ23-12, p. 817. Fig. P23-5, p. 818. Fig. 23-10, p. 795. Fig. 23-9, p. 794. Fig. 23-13a, p. 797. Fig. 23-13, p. 797. Fig. 23-11, p. 795. Fig. 23-13b, p. 797. Fig. 23-13c, p. 797.
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Atmospheric Refraction and Sun’s Position • Light rays from the sun are bent as they pass into the atmosphere. • It is a gradual bend because the light passes through layers of the atmosphere. • Each layer has a slightly different index of refraction. • The Sun is seen to be above the horizon even after it has fallen below it. Section 23.5
Atmospheric Refraction and Mirages • A mirage can be observed when the air above the ground is warmer than the air at higher elevations. • The rays in path B are directed toward the ground and then bent by refraction. • The observer sees both an upright and an inverted image. Section 23.5
Lenses work by refracting light Fig. 23-21, p. 805