Visible Light Spectrum

The range of wavelengths of visible light is approximately 380 to 750 nanometers (nm). In comparison, the wavelengths of audible sound typically range from about 1.7 centimeters (17,000 nm) for high frequencies to about 17 meters (17,000,000 nm) for low frequencies. Thus, visible light wavelengths are significantly shorter than those of audible sound, with light being several orders of magnitude smaller.

The violet end of the rainbow is the end with the shortest wavelength (highest frequency). The limits of perception are different for each individual, but industrial photometry considers the lower wavelength limit of human perception to occur at 360 nanometers = 0.000036 centimeter = about 0.000014 inch

When visible light strikes glass, it can be transmitted, reflected, or absorbed. Most of the light is transmitted through the glass, while a portion may be reflected off the surface. Any light absorbed by the glass typically converts to thermal energy, causing a slight increase in the glass's temperature. The specific fate of the energy depends on the properties of the glass and the angle of incidence of the light.

Violet light has the fastest frequency among the colors of visible light. In the visible spectrum, violet light has the shortest wavelength, which corresponds to a higher frequency compared to other colors. As frequency increases, energy also increases, making violet light the most energetic color in the visible range.

A camera captures visible light by allowing it to enter through the lens, which focuses the light onto a sensor or film. The sensor or film then records the intensity and color of the light, creating an image. When the shutter is opened, it exposes the sensor to the light for a specific duration, determining the exposure and overall brightness of the photo. This process transforms the light into a digital or chemical representation of the scene being photographed.

Ultraviolet (UV) light waves have shorter wavelengths than visible light waves, typically ranging from about 10 nm to 400 nm, while visible light ranges from approximately 400 nm to 700 nm. UV light carries more energy than visible light, which is why it can cause sunburn and skin damage. Both types of light are part of the electromagnetic spectrum, but they interact differently with matter and have distinct effects on biological organisms and materials.

When the wavelengths of spectral lines emitted from an object decrease toward the end of the visible light spectrum, it indicates that the object is moving toward the observer, a phenomenon known as the blue shift. This occurs due to the Doppler effect, where the frequency of light waves increases as the source approaches the observer. Consequently, the emitted light shifts toward shorter wavelengths, which can provide information about the object's velocity and motion in space.

Ultraviolet (UV) light would be bent more than visible light when passing through a prism. This is because UV light has a shorter wavelength than visible light, and shorter wavelengths are refracted more strongly as they pass through different mediums. The degree of bending, or refraction, is determined by the refractive index of the material, which varies with the wavelength of light. As a result, UV light experiences greater bending compared to visible light.

The part of the spectrum that can be seen by the human eye is known as the visible spectrum, which ranges approximately from 380 to 750 nanometers in wavelength. This spectrum includes colors from violet (shorter wavelengths) to red (longer wavelengths). The visible light spectrum is just a small portion of the electromagnetic spectrum, which also includes ultraviolet, infrared, and other types of radiation that are not visible to the naked eye.

You can feel heat because it is often associated with infrared radiation, which your skin can detect as thermal energy. In contrast, visible light does not produce the same thermal sensation because it primarily stimulates photoreceptors in your eyes rather than generating heat. While intense visible light can warm surfaces, our sensory system is not designed to perceive it as heat directly. Thus, we experience heat through temperature changes, but we see light through visual perception.

The prime danger is that one (or something) would be seen and viewed while he/she doesn't know. It would be a dangerous approach for spying and observing other activities.