A laser mounted on a spaceship traveling at half the speed of light does not change its speed to 1.5c; it remains at the speed of light, c, due to the first postulate of special relativity. Observers on the spaceship will measure the laser's speed as c, while external observers will see the laser's light as blue-shifted due to the spaceship's motion. The speed of light remains constant regardless of the observer's frame of reference, but the wavelength can change based on the observer's perspective. This illustrates the fundamental principles of relativity, emphasizing that speed and wavelength are perceived differently depending on the observer's motion. The discussion highlights the consistency of the speed of light across different frames of reference.
