# This has the effect of bending the path of light as

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what it is in a vacuum. This has the effect of bending the path of light as the light enters a medium and slows down. The more the light slows down, the more it bends towards the normal line. Light will

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also refract or bend when coming out of a medium and speed up. However, in this case it would refract or bend away from the normal line. In some materials, different wavelengths (or colors) of light travel at different speeds. This leads to the slower wavelengths of light being bent more than the faster ones due to refraction . The net effect is a spreading of the spectrum. We call this effect dispersion . To enhance dispersion , the side of glass where the light enters is placed at an angle to the side it exits. When the glass is cut in a triangle to enhance dispersion, we call it a prism. Waves A wave is a disturbance that moves energy from one place to another. There are two types of waves: transverse waves and longitudinal waves . In a transverse wave the field of the wave moves back and forth perpendicular to the direction of the wave. For example, when one end of a string is shaken, a transverse wave is produced. In a longitudinal wave the field of the wave moves back and forth in the same direction as the wave. For example, when one end of a spring is pulled, a longitudinal wave is produced. The wavelength ( 𝝀𝝀 - greek letter lambda) of a wave is the distance between two adjacent wave crests. The frequency of a wave is the number of wave crests that pass by a given point each second. The frequency ( 𝑓𝑓 ) and wavelength ( 𝜆𝜆 ) are related to the speed of the wave ( 𝑣𝑣 ) : 𝑣𝑣 = 𝜆𝜆𝑓𝑓 Light Light is an electromagnetic wave . This type of wave consists of an electric and a magnetic field that move simultaneously through space. The electric and magnetic fields are perpendicular to each other and to the direction the wave is traveling, which makes light a transverse wave.
• Fall '19
• Light, Behavior of light

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