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You are able to see yourself in a mirror because light rays bounce off you, hit the mirror, and reflect back to your eyes. Reflection, Refraction, Diffraction introduces students to these three properties of light. In this video, I define and explain the difference between reflection, refraction, and. Diffraction is the bending of waves around obstacles and openings. Two examples of reflection include light reflection in a mirror and sound reflection or echo. Waves such as light and sound waves can bend, slow down, and speed up. Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated, while refraction is the change in direction of a wave passing from one medium to another.
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When a light wave encounters an object, they are either transmitted, reflected, absorbed, refracted, polarized, diffracted, or scattered depending on the composition of the object and the wavelength of the light. Reflection, refraction and diffraction are all boundary behaviors of waves associated with the bending of the path of a wave. Such an arrangement of slits is called a diffraction grating.An interference pattern is created that is very similar to the one formed by double-slit diffraction (see Figure 17.8 and Figure 17.9). Wave Reflection Reflection is a bouncing back of a wave off a boundary. Light waves across the electromagnetic spectrum behave in similar ways. An interesting thing happens if you pass light through a large number of evenly-spaced parallel slits. The law is also satisfied in meta-materials, which allow light to be bent "backward" at a negative angle of refraction with a negative refractive index. are reflection, refraction, diffraction, and interference. In optics, the law is used in ray tracing to compute the angles of incidence or refraction, and in experimental optics to find the refractive index of a material. Whether a sound wave is reflected, refracted, or absorbed depends on the densities of the materials either side of the boundary. Snell's law (also known as the Snell–Descartes law, the ibn-Sahl law, and the law of refraction) is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves passing through a boundary between two different isotropic media, such as water, glass, or air. Since the velocity is lower in the second medium (v 2 < v 1), the angle of refraction θ 2 is less than the angle of incidence θ 1 that is, the ray in the higher-index medium is closer to the normal. Waves - Sound - Light - Water (See also Electromagnetic Waves and Plate Tectonics) The best way to remember the information in this chapter is to get a pen and paper and write down your answers before clicking on the Answer link which will take you to the correct page. Formula for refraction angles Refraction of light at the interface between two media of different refractive indices, with n 2 > n 1.