PH-1756

Refraction

Physics · Secondary 4 · Hard · Refraction

Light travels at

3.0 \times 10^8\,\text{m s}^{-1}

in air. In a certain plastic, the refractive index is 1.2. What is the speed of light in this plastic?

$2.5 \times 10^8\,\text{m s}^{-1}$
$1.2 \times 10^8\,\text{m s}^{-1}$
$3.0 \times 10^8\,\text{m s}^{-1}$
$3.6 \times 10^8\,\text{m s}^{-1}$

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