Question

Light enters from air into a glass plate having refractive index of 1.5 calculate the speed of light in glass 0

Answer 1

n=speed of light in air/speed of light in glass

$1.5 = \frac{3 \: \times {10}^{8} meter \: per \: seconds}{speed \: of \: light \: in \: glass}$

$speed \: of \: light \: in \: glass \: = \frac{3 \times {10}^{8} }{1.5}$

$= 2 \times {10}^{8} metres \: per \: second$

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