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Question

Isn't light supposed to have a constant speed of  3×108 m/s? And if it did have different speeds, would it be possible to find its acceleration?


Solution

Light travels at speed of 3×108 m/s only in vacuum. In other media, its speed is always less than 3×108 m/s.
It is impossible to measure the acceleration that light undergoes. This is because
a=ΔvΔt
But Δt in case of light is nearly zero so acceleration is indeterminate.

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