A ray of light always travels in a straight line, because:
A. Straight line path has the least distance.
B. Straight line path takes the least time.
Select the correct explanation.

A only

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B only

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Both A and B

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None of the above

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Solution

The correct option is B
B only

Light takes the path which takes the least time. As long as the light is in the same medium, it travels in a straight line from one point to another as a straight line is a path that takes the least time.

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