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In human vision, the physical properties of a light wave directly determine our perceptual experience. The wavelength of a light wave is perceived as its color (or hue), while its amplitude determines the perceived intensity or brightness of that light.

Relationship Between Physical Properties of Light and Visual Perception

An illustration of the visible light spectrum can demonstrate the relationship between a wave's physical properties and its perceived color. Such a diagram typically shows a series of colored waves, often from red to blue. The red wave is depicted with the longest wavelength and, consequently, the lowest frequency. As one moves through the spectrum towards the blue wave, the wavelengths progressively shorten, and the frequencies increase, visually confirming the inverse relationship between wavelength and frequency as it applies to light.

Visual Representation of Wavelength, Frequency, and Color

For humans, the visible spectrum is the portion of the electromagnetic spectrum that human eyes can see. It is associated with wavelengths from about $$380$$ to $$740$$ nanometers (nm), where a nanometer is one billionth of a meter.

The Human Visible Spectrum

An observer is shown two distinct light sources. Light Source A emits a bright blue light, while Light Source B emits a dim red light. How do the physical properties of the light waves from Source A compare to those from Source B?

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