Remind your 5th graders about the properties of light by having them examine this chapter. Physicists now recognize that light sometimes behaves like waves and, at other times, like particles. Product description this product is designed to help students master academic vocabulary and can be used to supplement a wellbalanced science curriculum. For most purposes, we may represent light in terms of its magnitude and direction. Starting from einstein we are talking about the duality of particles, where each particle has also certain wave properties. A photon is the smallest quantity quantum of energy which can be transported, and it was the realization that light travelled in discrete quanta that was the origins of quantum theory. In fact, the very act of seeing means receiving light and forming images in your mind from the light received by. Wavelengths are measured in nanometers nm and different wavelengths of light represent differing colors. This time, only white light emerged, as shown in figure 4. Properties of light and examination of isotropic substances this document last updated on 17oct2014 the optical properties of crystals are, next to xray diffraction and direct chemical analyses, the most reliable properties available to distinguish and identify minerals. Thermophysical properties database of materials for light. You might draw a series of parallel lines showing the path of. Convex lens thicker in the center than the edges bends light in.
A tv screen or computer monitor creates color using the primary colors of light. Mhr 147 producing the visible spectrum at one time, people believed that colour was something added to light. We investigated the direction and the frequency or color of light in todays lab. Divide into groups and allow each group to experiment with a flashlight. Chapter 2 properties of light gabriel popescu university of illinois at urbana.
Lens curved glass or transparent material that refracts light. Reflection reflection when a wave strikes an object and bounces off 3. The bending of light waves because of a change in velocity is called refraction. Thousands of red, green and blue phosphor dots emit light to make the images seen on monitors. He proposed that white light such as sunlight is the result of mixing together all the different colours of light.
Definition and properties of laser light environmental. Light is composed of energy particles called photons and can behave as either a wave or as separate particles. Visible light is usually defined as having wavelengths in the range of 400700 nanometers nm, or 4. The optical properties depend on the manner that visible light is transmitted through the crystal, and thus are. Light wave properties of light reflection refraction diffraction interference 2. Properties of light and examination of isotropic substances. This unit helps students explore the properties of light. Speed of light depends on media medium speed ms refractive index vacuum 3 x 108 air 2. Complete vocabulary miniunit for properties of light 5. Tap the plus button at the bottom right of the screen, then tap the sensor button circle with a wavy line in the toolbar. Properties of light and reflection 1 properties of light and reflection 2 reflection.
A beam of sunlight through a window lights up a section of the floor. When moving from place to place, light acts like a system. If you move the pencil rapidly, the waves will be larger and close together. To prove the monocromaticity of laser light, we can use prism. The information is based on many laboratory studies and records of a large number of existing structures that have provided satisfactory service for more than 85 years. Seawater physical properties light, viscosity, and pressure.
Electromagnetic radiation emr moving along rays in space. The light waves interfere when they have the same frequency, amplitude and phase producing regions of constructive interference and regions of destructive interference, they diffract in the same medium when they pass through a slit or by a sharp edge having dimensions near to the wavelength of the light waves light interference. The optical properties depend on the manner that visible light is transmitted through the crystal, and thus are dependent on crystal structure, crystal symmetry, and chemical composition of the mineral. Two key properties of light interacting with a medium are. Properties of light university of maryland college of. You might draw a series of parallel lines showing the path of the sunlight from the window to the floor. Typically, properties of lightweight concrete have been compared with those of. The wavelength of light is the distances between peaks in the waves as light travels. Monochromatic the light emitted from a laser is monochromatic. When white light struck a green leaf, people believed that the leaf was adding green to.
Mar 24, 2020 in most everyday circumstances, the properties of light can be derived from the theory of classical electromagnetism, in which light is described as coupled electric and magnetic fields propagating through space as a traveling wave. Most water lets at least some light through it, but this light is bent. Jan 21, 2020 in this simple device the image formation of a stationary object is formed on a photographic film or a white paper sheet. This short video explains one of the most important thing around us. Important physical properties light waves travel in air at a constant velocity until they penetrate another medium, such as glass or water, at which point they are suddenly slowed, causing the rays to bend. One of the many remarkable properties of light is its universal, constant speed. There is a plethora of lighting equipment on the market that you can acquire once you have found your preferred genre or niche in photography weddings, portraiture, landscape, glamour. Unlike the countryside, where there are many factors which influence the way in which light radiates, the lighting in. However, this wave theory, developed in the mid19th century, is not sufficient to explain the properties of. Toaverygoodapproximation, lighttravelsinstraightlines, and behavesmuchlikeaparticle.
To save the metadata to an external file, click save and name the file. For photovoltaic applications, this level of detail is seldom required and therefore only a few sentences on the quantum nature of light are given here. Light or visible light is electromagnetic radiation within the portion of the electromagnetic spectrum that can be perceived by the human eye. Understanding basic light properties for photography. Laser light is monochromatic, directional, and coherent. In the properties of light bending light lab you will explore how light rays interact as they pass from one material, or medium, to another. Properties of light waves, particles and em spectrum interaction with matter absorption re. Aug 19, 2011 light and its nature have caused a lot of ink to flow during these last decades. Champpgaign beckman institute quantitative lightimaging laboratory principles of optical imaging electrical and computer engineering, uiuc. In the figure such two rays emerging from object and passing through the hole and form image of the object,the image formed by this device is inverted. Light travels in s straight line as long as it is moving through a medium. The electromagnetic spectrum consists of electromagnetic waves of all frequencies.
Ex an orange is orange because it absorbs every color but orange, instead it reflects orange. Is the change in direction of a wave when it reaches a surface and bounces off that surface. Lightweight concrete this chapter covers some of the physical properties of lightweight concrete. Light can also be described in terms of a stream of photons, massless packets of energy, each travelling with wavelike properties at the speed of light. Its dual behavior is partly explained by 1doubleslit experiment of thomas young who represents the photons motion as a wave and also by 2the photoelectric effect in which the photon is considered as a particle. For example, a blue object reflects blue light and absorbs all others. Read it now enter your mobile number or email address below and well send you a link to download.
Whether you are looking at a light bulb, or a car, or this book, light brings information to your eyes. Theyhaveenergy,andonemeasure of this energy is the wavelength of the light. Choose file properties, click the description tab, and then click additional metadata. Introduction to light and color introduction to light light is a form of radiant energy or energy that travels in waves. We see that clearly when we put an object halfway into water and we see that the outside lines dont match up. Oct 16, 2017 the light waves interfere when they have the same frequency, amplitude and phase producing regions of constructive interference and regions of destructive interference, they diffract in the same medium when they pass through a slit or by a sharp edge having dimensions near to the wavelength of the light waves. Seawater physical properties light, viscosity, and pressure another important characteristic of water is how it transmits light. This short video explains one of the most important thing around us light. Physical properties of light light consists of photons particles with no mass which travelatthespeedoflight. Reflection incident ray reflected ray normal surface 6. Lesson 2, light properties worksheet 1 light properties worksheet 1. This short video explains one of the most important. Other types of electromagnetic radiation include gamma rays, xrays, ultraviolet light, infrared light, microwaves, and radio waves. To start an investigation in the science journal app, click on the menu three parallel lines at the.
First, we will examine the wavelike properties of light. Direct groups to watch while teacher directs the ray of light to the mirror. Medium is the substance through which light travels. Reflection incident ray reflected ray normal surface 4. Technological applications based on the manipulations of light include lasers, holography, and fibreoptic telecommunications systems in most everyday circumstances. Since greek times, scientists have debated the nature of light. Properties of light and electricity 45 the student will demonstrate. Oct 16, 2019 first, we will examine the wavelike properties of light. Glass,water,clear plastic and air are transparent materials. Light spectrum the appearance of light depends on its power spectrum how much power or energy at each wavelength daylight tungsten bulb our visual system converts a light spectrum into color this is a rather complex transformation the human visual system color perception light hits the retina, which contains photosensitive cells. In this way, newton showed that colour was a property of visible light.
Chapter 4 many properties of light can be understood using a wave model of light. Light readings andrew glassner, principles of digital image synthesis vol. Light is a form of energy which is given by luminous objects. From these three colors a wide range of colors can be produced.
The optical properties of crystals are, next to xray diffraction and direct chemical analyses, the most reliable properties available to distinguish and identify minerals. Thus laser light is monochromatic light means that laser light is only a single color light. The wavelength and frequency of light determine where the light is located along the electromagnetic spectrum. Summary of properties of light geometrical optics siyavula. Refraction bending of light waves due to a change in speed.
In a vacuum, light will travel in a straight line at fixed speed, carrying energy from one place to another. The electromagnetic spectrum can be divided into several bands based on the. The properties of light are intensity or brightness, direction, frequency or color and polarization. A tracing paper,frosted glass and waxed paper are translucent materials. A complete physical description of the properties of light requires a quantummechanical analysis of light, since light is a type of quantummechanical particle called a photon. Light is electromagnetic radiation that has properties of waves. Those light rays that passing through the hole form the image of the object. Other objects which do not give out light are called non luminous objects. Pdf the purpose of this study is to propose a way for teaching models of light to upper. Life in the aquarium can only exist with light but light is a complex physical phenomenon.
Explain the mechanism that causes light to be polarized, explain the use of. This property forms the basis of the fields of optics and optical communications and a myriad of related technologies, both mature and emerging. Understanding light characteristics, natural or artificial, will help elevate you to the next level of photography. Properties of light presentation pdf teach engineering. Light amplification by the stimulated emission of radiation properties first, lets discuss the properties of laser light and then we will go into how is is created. Light and its nature have caused a lot of ink to flow during these last decades. If this will not work for you, please go the lesson and copy the lab report from there. Black is the absence of color, white is the blending of all colors. If you do not shine orange light on it, it will appear black. Properties of waves the properties that waves have depend on the vibrations that produce the waves.
This video response worksheet and key is based on the bbc documentary series andrew marrs history of the world episode 4. Visible light is one type of electromagnetic radiation, which is a form of energy that exhibits wavelike behavior as it moves through space. You will receive a zip file which contains a video response worksheet in both pdf and editable docx formats and a video response worksheet key in both pdf. Properties of light interference and light diffraction. For example,if you move a pencil slowly up and down in a bowl of water, the waves produced by the pencils motion will be small and spread apart. Easy, fun way to help your students learn physical science vocabulary and prepare for the 5th grade science staar test.