If lifeguard sitting outside a swimming pool observes a boy drowning in water, in which direction he has to travel with Maximum possible speeds in air and water to reach the boy in shortest time
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a
along shortest path from his initial position to boy
b
parallel to bank of the pool on ground and normal to it to reach the boy.
c
along the path followed by a refracted light ray from his position to the boy.
d
along any path of his choice
answer is C.
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Detailed Solution
As per the Fermat's principle of least time, the time taken to move from one point to another is minimum for the path taken by light.