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Q.
Speed of light in vacuum is
Ray Optics and Optical Instruments
Solution:
Light travels with a speed of $c=2.99792458 \times 10^{8}\, ms ^{-1}$.
For many purposes, it suffices to take $c=3 \times 10^{8} \,ms ^{-1}$.
The speed of light in vacuum is the highest speed attainable in nature.