Construct Your Own ProblemConsider sunlight entering the Earth’s atmosphere at sunrise and sunset—that is, at a 90.0° incident angle. Taking the boundary between nearly empty space and the atmosphere to be sudden, calculate the angle ofrefraction for sunlight. This lengthens the time the Sun appears to be above the horizon, both at sunrise and sunset. Now construct a problem in which you determine the angle of refraction for different models ofthe atmosphere, such as various layers of varyingdensity. Your instructor may wish to guide you on the level of complexity to consider and on how the index of refraction varies with air density.

Construct Your Own ProblemConsider sunlight entering the Earth’s atmosphere at sunrise and sunset—that is, at a 90.0° incident angle. Taking the boundary between nearly empty space and the atmosphere to be sudden, calculate the angle ofrefraction for sunlight. This lengthens the time the Sun appears to be above the horizon, both at sunrise and sunset. Now construct a problem in which you determine the angle of refraction for different models ofthe atmosphere, such as various layers of varyingdensity. Your instructor may wish to guide you on the level of complexity to consider and on how the index of refraction varies with air density.