A line drawn in the direction of propagation of light is called a ray of light. Worksheet 2 pages and homework 1 page with answers for refraction of light. Reflection and refraction 17 be scattered away from its original direction figure 2. Notes physics module 6 reflection and refraction of light optics and optical instruments 190 zthe ray of light parallel to the principal axis, on reflection, passes through the focus. Refraction of light is the most commonly observed phenomenon, but other waves such as sound waves and water waves also experience refraction. Draw a diagram to represent a light ray striking a glass block that is partially reflected and partially refracted. In the chapter on light matter interaction we saw that when light. Students will determine what is happening to the light in the image reflect, refract, absorb or transmit.
This scattering is caused by the interaction of light with small particles, even atoms or molecules, within the material. The light may be reflected back from the surface, transmitted through the material in which case it will deviate from its initial direction, a process known as refraction or absorbed by the material if. We see a variety of objects in the world around us. The reflection and refraction of light rays and wave fronts light is a very complex phenomenon, but in many situations its behavior can be understood with a simple model based on rays and wave fronts. In the chapter on lightmatter interaction we saw that when light. The incident ray, the reflected ray and the normal are all in the same plane 2.
To locate an image, any two of these three rays can be chosen. Refraction of light pdf refraction is the bending of light when it reading architectural working drawings residential and light goes from one transparent medium to. Whenever a light strikes the surface of some material at an angle, part of the wave is reflected and part is transmitted or absorbed. Refraction map 3ds max 2016 autodesk knowledge network. As for reflection, a simple law characterizes the behavior of a refracted ray of light. This is called total internal refraction this happens when light tries to pass from a dense medium glass to a lessdense medium air at a shallow angle 16 air glass. Electromagnetic waves are ultimately produced by an accelerating charge. When light travels towards a medium of lower index of refraction, no refracted ray will emerge for incident rays with. Because n generally decreases with wavelength dnd 14. The law of reflection still holds, however, at each small section of. Feb 09, 2012 each other for reflection and transmission from isotropic media. Reflection, is when the light goes back to the previous medium, but changes direction. If light passes into a medium with a smaller index of refraction, the angle of refraction is larger. Refraction of light in water physics stack exchange.
Common examples are reflection of light, as shown in figure 21. Lenses, refraction, refractive index, total internal. Light, reflection, and color characteristics of light light is an electromagnetic wave. There is an angle of incidence for which the angle of refraction will be 90. When this happens, no light at all escapes the medium with the larg er index of refraction and 100% of the light is reflected. The reflected light from an object looks as through it came from a point behind. Refraction is used to guide light in optical instruments.
Snells law also predicts the phenomenon of total internal reflection. If the angle of refraction is 60, what was the incident angle inside the ruby. All books are in clear copy here, and all files are secure so dont worry about it. A ray is a thin beam of light that travels in a straight line. For incident angles larger than the critical angle, there is no refraction. One important consequence of snells law of refraction is the phenomenon of total internal re.
Download chapter10 light reflection and refraction ncert. Light reflection and refraction important questions and answers. A wave front is the line not necessarily straight or surface connecting all the. To an astronaut in space, the sky will appear to be a violet b red c blue. Reflection and refraction of light lecture youtube. Difference between reflection and refraction with comparison. The law of reflection still holds, however, at each small section of the surface. List four properties of the image formed by a concave mirror, when object is placed between focus and pole of. Snells law reflection and refraction of light chapter 3 physics. You will have an opportunity to learn the remaining principles in this experiment.
The light may be reflected back from the surface, transmitted through the material in which case it will deviate from its initial direction, a process known as refraction or absorbed by the material if it is not transparent at the. Module 6 reflection and refraction of light optics and optical instruments 190 zthe ray of light parallel to the principal axis, on reflection, passes through the focus. Feb 14, 2010 snells law reflection and refraction of light chapter 3 physics. Light reflection and refraction notes for class 10 formulas download pdf. It is formed at the same distance behind the mirror as the object is in front of the mirror. Heres a question in a paper based on refraction of light. Objects that produce light are called luminous and are considered sources of light.
It is possible to see a light source even in the dark because the light passes directly into the eyes. All refraction of light and reflection occurs at an interface. Interaction of waves reflection, refraction, diffraction and interference reflection a wave strikes a barrier and bounces back a mirror creates a reverse image of an object as light waves are reflected off the shiny surface refraction the bending of a wave due to a change in speed because it passes through a new medium styrofoam cup. To investigate the reflection and refraction of light. Explanation for refraction and dispersion of light, based on.
Physics 100 multiple choice questions with answer for ssc. Light reflection and refraction notes for class 10 download pdf. Refraction is when the speed and direction of light changes, as light moves from one. It is natural to treat the propagation of light in terms of rays. So, for a given image format and thereby a given diameter of the. Total internal reflection in the equation above, if the term inside the sqrt is negative, then there is no refraction. On the flip side, refraction is when light is absorbed by the medium but the direction and speed is affected.
The angle of incidence is equal to the angle of reflection. Monday through friday questions covering properties of matter, reflection and refraction. Reflection and transmission of light from multilayer films. Because n generally decreases with wavelength dnd refraction angles.
According to the law of refraction, also known as snells law. A spherical metasurface with phase discontinuities leads to unconventional light bending compared to standard refractive lenses. The angles of incidence and reflection are measured with respect to the normal to the reflecting surface, as shown in figure 2. Read online th physics light reflection and refraction book pdf free download link book now.
Total internal reflection if the angle of incidence is larger than this, no transmission occurs. List four properties of the image formed by a plane mirror. Because of diffuse reflection in all directions, an ordinary object can be. Using that the speed of light is v c n we deduced that. Light entering the substance from air at 38 to the normal is refracted to 23. A ray is equivalent to a very narrow beam of light, and it. How much a wave is refracted is determined by the change in wave speed and the initial direction of wave propagation relative to the direction of change in speed. As shown below, an electromagnetic wave is a transverse wave consisting of mutually perpendicular oscillating electric and magnetic fields. Refraction of light refraction is the change of speed of light when it moves from one medium into another. Read online chapter10 light reflection and refraction ncert. When light hits the interface between a medium with a larger index of refraction and a medium with a smaller index of refraction i. Reflection and refraction are two commonly observed optical properties of light. Total internal reflection is the internal reflection of light at the surface in a medium when the angle of incidence in the denser medium exceeds a critical angle.
Due to refraction, the velocity of transmitted light is. Lenses for imaging are the most common application of refraction, and iwill be discussed in detail in a later section. Reflection and refraction when light hits a surface, one or more of three things may happen. Light may perform reflection, refraction and other phenomenon. For each angle of incidence, record the angle of reflection reflection 1. Light reflection and refraction 161 let us recall these laws i the angle of incidence is equal to the angle of reflection, and ii the incident ray, the normal to the mirror at the point of incidence and the reflected ray, all lie in the same plane. Class room lecture on reflection and refraction of light.
Including refraction of light rays through parallelsided rectangular glass blocks, and prisms. A group of rays of light emitted by a source of light is called a beam of light. Mar 21, 2020 download chapter10 light reflection and refraction ncert. When light is reflected from a smooth surface the rays incident at a given angle. Due to refraction, the velocity of transmitted light is less than the velocity before it entered the medium.
Th physics light reflection and refraction pdf book. They are also given a list of items that are sorted in a tchart, and students must decide which prope. Index of refraction the index of refraction ior controls the amount by which the material refracts transmitted light. These laws of reflection are applicable to all types of reflecting surfaces. By rotating the ray table, set the angle of incidence to each of the settings shown in table 2.
Change the angle of incidence to 20 0, 40 0 and 60 0. When light falls on a highly polished surface like a mirror most of the light is sent back into the same medium. Interaction of waves reflection, refraction, diffraction and interference reflection a wave strikes a barrier and bounces back a mirror creates a reverse image of an object as light waves are reflected off the shiny surface refraction the bending of a wave due to a. Knowing the difference between reflection and refraction will help you understand basic phenomenon of science. Refraction 2 of 3 light ray going from air to glass then back to air duration.
Pdf reflection and refraction of light from metasurfaces with. Students will need to be able to differentiate between a light source and a reflection. Light rays change direction when they reflect off a surface, move from one transparent medium into another, or travel through a medium whose composition is continuously changing. In physics, refraction is the change in direction of a wave passing from one medium to another or from a gradual change in the medium. How much a wave is refracted is determined by the change in wave speed and the initial direction of wave propagation. Light is a form of energy, which induces the sensation of vision in our eyes and. When light is reflected from a smooth surface the rays incident at a. If light is propagating from a more dense to a less dense medium in the optical sense, i. The scattered light goes off in many different directions, and may be scattered again and again before it is finally absorbed. The eyes and brain trace the light rays back into the water as though they had not refracted, but traveled from the object in a straight line, creating a virtual image of the object that appears at a shallower depth. Download th physics light reflection and refraction book pdf free download link or read online here in pdf. Light entering the substance from air at 38 to the normal. When light is incident upon a rough surface, even microscopically rough such as this page, it is reflected in many directions, as shown in fig.
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