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Measuring light intensity • Irradiance is total amount of light incident on a surface – Includes scattered light – Measured with a 180° lens (photographic light meter) • Radiance is light emitted from specific area – Measured with tube over area of interest – Must specify angle of measurement
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Many known properties of light could be explained easily by a particle model. For example it was known that when light reflects from a smooth surface, the angle of incidence is equal to the angle of reflection. This is also how an elastic, frictionless ball bounces from a smooth surface. As we shall see, a key property for the particle theory is
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Our understanding of light starts with what light does and what its properties are (Figure 10.1). We know that: • light travels extremely fast and over long distances; • light carries energy and information; • light travels in straight lines; • light bounces and bends when it comes in contact with objects; • light has color; and
Everything you see, either emits or reflects light. Essential Questions: What are the properties of light? Can you solve for the frequency or wavelength given the other? Can you describe various uses for the different wavelengths/frequencies of the electromagnetic spectrum? How does the Doppler Effect apply to light?
Oct 17, 2014 · Light. Light is electromagnetic radiation that has properties of waves. The electromagnetic spectrum can be divided into several bands based on the wavelength. As we have discussed before, visible light represents a narrow group of wavelengths between about 380 nm and 730 nm.
Light and Optics: We just learned that light is a wave (an "electromagnetic wave", with very small wavelength). But in many cases, you can safely ignore the wave nature of light! Light was studied for a long time (obviously), long before Maxwell, and very well understood. People thought about light as sort of like a
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• Light is the only thing we actually see – e.g. When I “see” you, I am actually seeing light reflected off you. • Light is a transverse wave (recall earlier), whose origin is accelerating electrons, e.g. in the sun • Accelerating electrons not only can produce light, but also radio waves, microwaves, x-rays…. Grouped together as
