Question

when the medium is uniform, how do light waves travel through it?
○ irregular motion
○ circular motion
○ vibrating motion
○ straight line motion

Explanation:

In a uniform medium, light waves travel in straight lines. This is a fundamental principle of light propagation (rectilinear propagation of light). Irregular motion is random and not how light travels in uniform media. Circular motion is not the path of light in a uniform medium. Vibrating motion describes the oscillation of particles in a wave but not the path of light propagation. So the correct option is the one with straight line motion.

Answer:

D. straight line motion (assuming the options are labeled A to D with A: irregular motion, B: circular motion, C: vibrating motion, D: straight line motion)