The speed of light always has the same value in a vacuum:
A) but its speed inside a transparent material depends on the temperature of the material and can be faster or slower than its speed in a vacuum.
B) as it does in transparent materials.
C) but is slower in transparent materials such as water and glass.
D) but is faster in transparent materials such as water and glass.

Question

Quizplus · Accepted Answer

The speed of light is constant in a vacuum, but it slows down when it passes through transparent materials like water and glass due to the interaction with the material's atoms.

The Speed of Light Always Has the Same Value in a Vacuum