4. Refraction is caused by the fact that (a) different media have different speeds of light, (b)...

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4. Refraction is caused by the fact that

(a) different media have different speeds of light,

(b) a given medium has different speeds of light for different wavelengths,

(c) the angle of incidence is greater than the critical angle,

(d) a given medium has different indices of refraction for different angles of incidence.

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