Light travels in a straight line (rectilinear propagation of light). This statement does hold if the medium of travel for light is

of variable refractive index
made up of slabs of different refractive indices
homogeneous and transparent
inhomogeneous and transparent

Correct Answer: homogeneous and transparent

Explanation:

In vacuum and in homogeneous, transparent media, such as air, water, and glass, light moves in a straight line. When light encounters a boundary between two different transparent media, some light is reflected and some moves from the first into the second medium.

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