PH-1755

Refraction

Physics · Secondary 4 · Medium · Refraction

Light travels at

3.0\times10^8\,\text{m s}^{-1}

in air. In a certain glass, its speed is

2.0\times10^8\,\text{m s}^{-1}

. What is the refractive index of this glass?

1.5
0.67
2.0
4.5

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