It is because of this distortion that step-index fibers are only used for applications that have shorter fiber lengths.įor graded-mode fibers, the index of refraction of the core decreases mas the radius of the fiber gets larger. This causes the light to move in a zigzag pattern down the length of the fiber, and because of this there is a considerable distortion in the light pulse. In step-index fibers, there is a very large decrease in the index of refraction at the interface between the glass fiber and its cladding. These fiber types are shown in Figure 4.įigure 4: Schematics and comparison of Fiber Optic Cable types. This is achieved with one of three types of fiber: step-index fiber, graded-index fiber (multimode), or single-mode fiber. Because the fibers are not laid out in straight lines, the light must be guided down the length of the fiber. Fiber Optics are used for many applications, from telecommunications to data transmission in high speed servers. You can use the curved part of a spoon as a mirror because it _ light.\]where ε is the the permativity and μ is the permeability of the particular material.Ī very important application of Snell's Law is Fiber Optics. The surface of the coating is rough, so light that shines on it gets scattered in many directions. The surface of the coating allows light from the room to pass through but blocks the light from the screen. The coating bends light that passes through it and prevents the light from reaching the user's eyes. The coating absorbs light that shines on it and prevents the light from reflecting. Which best explains how the coating works? Some computer screens have a special coating to reduce glare. Right side up right side up Glare appears on a computer screen when light from the surroundings reflects off of the screen's surface. Which describes one feature of the image formed by a plane mirror? The measure of angle B equals the measure of angle C. The measure of angle B equals the measure of angle D. The measure of angle A equals the measure of angle C. The measure of angle A equals the measure of angle B. The diagram below illustrates the law of reflection.Īccording to the law of reflection, which statement must be true? The normal is a line perpendicular to the surface of the mirror. The angle of reflection is the angle between the reflected ray and the incoming ray. The angle of reflection is the angle between the incoming ray and the normal. The normal is a line perpendicular to the incoming ray. Which statement corrects an error on the site? The site states that after light hits a mirror, the angle of reflection is the angle between the reflected ray and the normal, which is the surface of the mirror. Harry is reading an online summary of the law of reflection. It bounces the light toward a focal point. It bounces the light away from a focal point. It bends the light away from a focal point. Where will the image of the paper clip appear to the observer?Ĥ 3 How does a concave mirror form an image? The diagram below shows a paper clip in front of a mirror. Which type of surface is best able to reflect light?Ī smooth, cloudy surface.
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