Physics for IGCSE & O level - Rays And Waves (Section 7 - No. 16)
What determines the refractive index of a material?
The angle of incidence
The speed of light in a vacuum and the speed of light in the material.
The colour of light
The temperature of the material
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The refractive index is determined by the ratio of the speed of light in a vacuum to the speed of light in the material.