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Speed of light in glass is 2×10 power 8 m/sec, speed of light in vaccum is 3×10 power 8m/ sec. Find the refractive index of glass.



Let u(miu) be the refractive index ,

since , u = c/v

u = 3×10^8 / 2× 10^8

u = 3/2 = 1.5

Hope it helps ... ^_^
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Speed of light in glass = 2×10⁸ m/s
speed of light in vacuum = 3×10⁸ m/s

Refractive index of glass (\mu)= \frac{spped\ of\ light\ in\ vacuum}{spped\ of\ light\ in\ glass}

\Rightarrow \mu= \frac{3 \times 10^8}{2 \times 10^8} \\ \\ \Rightarrow \mu= \frac{3}{2} \\ \\ \Rightarrow \mu= \boxed{1.5} 
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