Question

if the speed of light in water of relative index 4/3 is 2.25 *10^8 m/s.what will be the speed of light of vacuum (answer is 3 *10^8 m/s)
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Answer 1

Answer:

The speed of light of vacuum $3\times 10^8 m/s$

Explanation:

Speed of light in water $v=2.25\times10^8 m/s$

The refractive index of glass is n=4/3

Speed of light is glass c

The refractive index = Speed of light in Vaccum  /speed of light in any medium (Water)

$n=\frac{c}{v} \\c=n \times v\\c=\frac{4}{3} \times 2.25 \times 10^8\\c=3\times 10^8 m/s$

Therefore the speed of light of vacuum $3\times 10^8 m/s$

Answer 2

Answer:

as written in the upside the answer is correct

3*10^8