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Apr 24, 2017 · A Ray of Light. When an electromagnetic source generates light, the light travels outward as a series of concentric spheres spaced in accordance with the vibration of the source. Light always takes the shortest path between a source and destination. A line drawn from the source to the destination, perpendicular to the wave-fronts, is called a ray.
Light is a type of electromagnetic radiation that can be detected by the eye. It travels as a transverse wave. Unlike a sound waves, light waves do not need a medium to pass through, they can ...
- What Is The Electromagnetic Spectrum?
- How We Measure Light
- What Different Types of Light Tell Us
The electromagnetic spectrum describes all of the kinds of light, including those the human eye cannot see. In fact, most of the light in the universe is invisible to our eyes. The light we can see, made up of the individual colors of the rainbow, represents only a very small portion of the electromagnetic spectrum. Other types of light include rad...
Light travels in waves, much like the waves you find in the ocean. As a wave, light has several basic properties that describe it. One is frequency, which counts the number of waves that pass by a given point in one second. Another is wavelength, the distance from the peak of one wave to the peak of the next. These properties are closely and invers...
To study the universe, astronomers employ the entire electromagnetic spectrum. Different types of light tell us different things. Radio waves and microwaves, which have the lowest energies, allow scientists to pierce dense, interstellar clouds to see the motion of cold gas. Infrared light is used to see through cold dust; study warm gas and dust, a...
Light is a form of energy. It can come from many sources, for example: glow sticks. Some animals, such as fireflies and glow-worms, are also light sources. They make their own light to attract ...
Apr 8, 2008 · The electromagnetic spectrum describes different types of radiation, from visible light to gamma rays and more. Energy travels throughout the universe at the speed of light as radiation. What that radiation is called depends on its energy level. At the really high-energy end of the spectrum are gamma rays. They’re close cousins to the X-rays ...
The word “ray” comes from mathematics and here means a straight line that originates at some point. Figure 25.1.1 25.1. 1: Three methods for light to travel from a source to another location. (a) Light reaches the upper atmosphere of Earth traveling through empty space directly from the source. (b) Light can reach a person in one of two ways.
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Section Summary. A straight line that originates at some point is called a ray. The part of optics dealing with the ray aspect of light is called geometric optics. Light can travel in three ways from a source to another location: (1) directly from the source through empty space; (2) through various media; (3) after being reflected from a mirror.
