Essays on Visible Light

Ultraviolet light (UV light) is a type of electromagnetic radiation that is located between visible light and X-rays in the electromagnetic spectrum. It is invisible to the human eye, and has a frequency greater than that of visible light but lesser than X-rays. It has a wavelength ranging from about 10 nm to 400 nm (ISO, 2007). UV light is a part of the radiation that comes from the sun. It can also be produced artificially by electric arcs, black lights, tanning lamps and mercury vapor lamps. The name Ultraviolet literally translates to “beyond violet”, as it has a ...

Chapter 1 – Introduction to Color Study

1. What is the difference between direct light and reflected light? Give examples of each. Direct light travels from the source to the destination without being interrupted while reflected light is the light produced when the direct light bounces off a material. One example of direct light is the sunlight while reflection from the mirror is an example of reflected light (Young, Freedman & Ford, pp. 1080). 2. Describe the cause of color, the means used to generate it, and the effect. Light consists of a spectrum of light wavelengths which have a representative color; thus, upon reaching the retina ...

Introduction

There are environmental chemical processes which require light to react. These processes are called photochemical reactions. Photochemical reaction is commonly initiated due to the absorption of solar energy or light. When molecules absorb energy in the form of light, the atoms are converted in a transient excited state (Larson & Weber, 1994). This transition state or excited has completely different physical and chemical properties with the initial state of the molecule. The excited states also have more tendencies to react since they are considered stronger acids and stronger reductants that the initial state of the molecule. The excited state of ...

Infrared Cameras

Introduction An infrared camera is a non-contact device that detects infrared energy and converts it into a visible light display. The infrared energy is first translated into electrical impulses that are then converted into data for camera display. The image or video formed on the screen is of different colors depending on the intensity of the infrared emission. Most cameras have built-in visible light digital cameras that allow merging of infrared and visual images. There are two different types of infrared cameras; cooled cameras and uncooled cameras. The cooled infrared cameras produce superior image qualities than uncooled cameras but ...

Introduction:

Transmission electron microscope (TEM) is the type of a microscope that uses a beam of electron rather than visible light to illuminate the specimen. Besides, while light microscope uses glass lens to focus light to the specimen, TEM uses electromagnetic lenses for focusing of the electron beam. TEM has a higher resolving power than the light microscope because the electron beam it uses for illumination has a much lower wavelength than visible light. During the operation of TEM, some electrons passing through the specimen get scattered and disappear from the beam. However, the unscattered electrons reach a fluorescence screen ...

The purpose of this paper is to particularize the historical, science and technological impact of Li-Fi, to also include the vast reaching context of this incredible point in the wireless timeline. The paper seeks to establish the historic background of the Li-Fi technology as well as its technical working. The possibilities of Li-Fi extend to the application in military and undersurface communication operations. Traffic Management is another area where LED will be of great use. Li-Fi can be used in LED lights traffic managements. Other areas where Li-Fi will be ideal include disaster management, remote location positioning and dead ...

Introduction

Interactions between atmospheric energy and matter and with the surface of the earth play an important role in remote sensing. There is a constant interaction between the surface of the earth, electromagnetic radiation and the atmosphere. This interaction determines the spectral areas through which remote sensing can be done (Bucholtz, 1995, 2769). Electromagnetic radiation is propagated via the earth's atmosphere at the speed of light once it has been generated. Since the earth's atmosphere is not a vacuum, it has a different impact on the wavelength, spectral distribution, speed and direction of radiation.

Scattering

One of the results obtained for ...