Answer 1_2_2

What is the speed of light in glass, refractive index 1.5, when the speed of light in air is 3.0 x 10⁸ m/s?

n2/n1 = c1/c2

1.5 / 1.0 = 3 x 10⁸ / c2

c2 = 3 x 10⁸ / 1.5 = 2 x 10⁸ m/s

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