Question

the speed of light in vacuum is 3 into 10 raise to power 8 metre per second and glass is 2.1 into 10 raise to power8 metre.find the refractive index
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Answer 1

Answer:

Refractive index of glass is 1.428

Explanation:

Speed of light in air $c= = 3\times10^8 m/s$

Speed of light in glass $v= 2\times 10^8 m/s$

The refractive index of glass is n

The refractive index = Speed of light in air/speed of light in any medium (glass)

$n = \frac{c}{v} \\n = \frac{3 \times 10^8}{2.1 \times 10^8} \\n = 1.428$

Therefore the refractive index of glass is 1.428