Rectilinear propagation — light travelling in a straight line — holds true specifically when the travel medium is?

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1. Rectilinear propagation — light travelling in a straight line — holds true specifically when the travel medium is?

Of variable refractive index

Made up of slabs of differing refractive index

Homogeneous and transparent

Inhomogeneous and transparent

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Light travels in a genuinely straight line only through a homogeneous, transparent medium. A medium with varying refractive index bends light, as happens in mirages.