In vacuum, the speed of light is a fundamental constant and remains constant regardless of its wavelength, frequency, or intensity. This means that option 4, "neither depends on its wavelength, frequency nor intensity," is the correct answer.

The speed of light is approximately 299,792,458 meters per second in a vacuum. It is important to note that the speed of light can vary when it passes through a medium other than a vacuum, such as air or water, due to interactions with atoms and molecules in the medium. In these cases, the speed of light is slightly slower than in a vacuum.

Option 1 states that the speed of light depends on its wavelength. This is incorrect because the speed of light remains constant regardless of its wavelength. Wavelength is a property of light that describes the distance between two consecutive peaks or troughs.

Option 2 suggests that the speed of light depends on its frequency. However, this is also incorrect as the speed of light remains constant regardless of its frequency. Frequency is a property of light that describes the number of oscillations per second.

Option 3 states that the speed of light depends on its intensity. This is also incorrect because the speed of light remains constant regardless of its intensity. Intensity refers to the amount of