Light travels and maintains its ______ until it interacts with an object or moves from one medium to another.

• A. Velocity
• B. Color
• C. Direction
• D. Temperature

Answer: (C)

Light tends to move in a straight path through a uniform space, keeping the same direction unless something changes its course. The word that fits best is direction because the path stays the same until it hits something or crosses into a different medium. When light meets an object, it can bounce off and change direction (reflection), and when it passes from one medium to another, it can bend (refraction) and alter its path. Velocity can change with a different medium, and color is set by the light’s wavelength, but the statement is describing the path’s direction, not its speed or color. Temperature isn’t involved in how light travels.