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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along shortest path from his initial position to boy

parallel to bank of the pool on ground and normal to it to reach the boy.

along the path followed by a refracted light ray from his position to the boy.

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.

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