Question

a) In the situation below a lifeguard is trying to save a drowning man. He starts running at point P and the drowning man is at point Q. The lifeguard has speed v1 in the sand and speed v2 in the water, as shown. What path should the lifeguard follow in order to get to the drowning man as fast as possible? What is the condition that has to be met?

b) If the lifeguard is a ray of light, show that the condition above (answer from part a) is essentially Snell’s law:

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Answer #1

Pe- d 10-9 Ver d-y-A 中2 dl

+y d- 92 u91 take the laat tinue to get nem ene pot to anites

2- c beth sides lyea US a ni - n2 Snell a

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Answer 1

Pe- d 10-9 Ver d-y-A 中2 dl

+y d- 92 u91 take the laat tinue to get nem ene pot to anites

2- c beth sides lyea US a ni - n2 Snell a