Question

( which expression is used to convey that light travels in straight lines)​

Answer 1

Answer:

The Rectilinear Propagation of Light describes that Light travels in a Straight Line. A mirror changes the direction of Light that falls on it and it travels in a Straight line Path.

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Answer 2

Answer:

Rectilinear propagation

Explanation:

Rectilinear propagation describes the tendency of electromagnetic waves (light) to travel in a straight line. Light does not deviate when travelling through a homogeneous medium, which has the same refractive index throughout; otherwise, light suffers refraction.