How do the different
To Explain: The different speed of light in thin air and dense air affect the length of daylight.
Answer to Problem 42A
The slower speed of light in denser air causes downward refraction, which lengthens the amount of daylight hours.
Explanation of Solution
Introduction: Change in the direction of light or bending of light when it (light) travels from one medium to different medium, known as Refraction.
Explanation: A light ray is always at the right angles to its wave front. Light travels faster in the thin air. The difference in speed may cause sunlight to be bent. Also, at sunset, the bending of a light as it moves through atmosphere may cause the sun to be seen (or visible) after it has sunk below horizon, making a day longer.
Conclusion: The laser beam bends in the direction of the normal when it enters the water, and away from the normal when it leaves.
Chapter 29 Solutions
Conceptual Physics: The High School Physics Program
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