Question

calculate speed of light in 1)glass 2) water . Refractive index of glass is 1.5 and water is 1.33 (Take speed of light in air or vaccum c= 3x10^8 m/s)​

Answer 1

Answer:

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$Refractive \: index (μ) = 1.33 = \frac{4}{3}$

speed of light in air =

$3 \times {10}^{8}$

speed of light in water = ?

We know that,

$μ = \frac{c}{v}$

$\frac{4}{3} = \frac{3 \times {10}^{8} }{v}$

$v = \frac{3 \times 3 \times {10}^{8} }{4}$

$= \frac{9 \times {10}^{8} }{4}$

$v = 2.25 \times {10}^{8} \frac{m}{s}$

Hence speed of light in water is 2.25 × 108m/s....

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