Question

given that the speed of light in air is 3 x 10 power 8 m/ s calculate the change in its speed when it enters a medium of refractive index 1.62​

Answer 1

Refractive index= Speed in air/Speed on medium

$1.62 = \frac{3 \times {10}^{8} }{x} \\ x = \frac{3 \times 10 {}^{8} }{1.62} = 1.85 \times {10}^{8}$

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