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1 of 9© Boardworks Ltd 2013 Reflection, Refraction and Diffraction
2 of 9© Boardworks Ltd 2013 What happens when waves hit a surface? How the waves behave depends on their energy and the type of material they interact with. For example, light waves are reflected by skin, but X-rays transmitted through skin. If electromagnetic waves are absorbed, some of their energy is transferred to the material. This usually increases the temperature of the material. When electromagnetic (EM) waves hit a surface, they can be reflected, absorbed or transmitted.
3 of 9© Boardworks Ltd 2013 Investigating reflection
4 of 9© Boardworks Ltd 2013 Spear fishing has been used for centuries and is still practiced by subsistence communities. What is refraction? As the light crosses the boundary between fluid and glass, it is bent, producing a distorted image. The straw appears to be bent in the liquid. What is causing this effect? This known as refraction. To accurately spear the fish, fishermen learn to aim a short distance behind the fish’s image, in order to compensate for the effect of refraction.
5 of 9© Boardworks Ltd 2013 Refraction in a glass block
6 of 9© Boardworks Ltd 2013 Understanding why light refracts
7 of 9© Boardworks Ltd 2013 What is diffraction? Diffraction is a property of all waves, which can be shown by water waves in a ripple tank. So, when radio waves travel past an obstacle or through a narrow gap, they bend or spread out due to diffraction. Here, the waves travel along until they reach a gap. The width of the gap is similar to the wavelength of the waves. The waves pass through the gap and spread out. This is diffraction.
8 of 9© Boardworks Ltd 2013 How does wavelength affect diffraction? The amount of diffraction depends on how the wavelength compares with the size of the gap. What happens if the wavelength is much smaller than the width of the gap? In this case, only the edges of the wave front are diffracted. Maximum diffraction occurs when the wavelength is similar to the gap size.
9 of 9© Boardworks Ltd 2013 Why can I receive radio but not TV?
Copyright © Houghton Mifflin Harcourt Publishing Company Unit 3 Lesson 2 Interactions of Light.
© Boardworks Ltd of 20 © Boardworks Ltd of 47 KS3 Physics 8K Light.
J. Pulickeel SPH3U1 January Wave Behavior What type of waves do not travel through a medium? What types of waves travel through a medium? Name.
Introduction to Waves Definition of wave A periodic disturbance which travels through a medium from one point in space to the others. Wave motion means.
Chapter 20. What do you think of when you hear the word wave? Write a brief description of what you know about them.
P1.5 The use of waves P1.5 The use of waves for communication and to provide evidence that the universe is expanding Electromagnetic radiations travel.
Chapter 17 Mechanical Waves and Sound. Chapter 17 *Mechanical wave- disturbance in matter that carries energy from one place to another *Mechanical wave-
Refraction Refraction of Water Waves Light Rays in Glass Atmospheric Refraction Apparent Depth Refraction is responsible for why objects look bent in water.
Principles of Physics. Boundary Where 2 media meet Where wave conditions change Reflection, transmission, or both can occur.
Propagation. Radio propagation is the behaviour of radio waves when they are transmitted, or propagated from one point on the Earth to another, or into.
Chapter 10 Waves. Chapter 1o Section 1 The Nature of Waves.
Properties of Light. ELECTROMAGNETIC WAVES Light is an example of an electromagnetic wave. It requires no medium through which to travel.
Introduction to Waves Auto slide change for this page, WAIT…..
WAVES. Waves can be… Water waves Sound waves Light waves Earthquake waves Waves in a slinky Stadium waves.
© Boardworks Ltd of 32. © Boardworks Ltd of 32.
The Behavior of Waves. Reflection Reflection occurs when a wave strikes an object and bounces off of it.Reflection occurs when a wave strikes an object.
Properties and Characteristics. What do we know about EM waves in general? They are ALL EnergyRadiation! Non-mechanical Transverse waves –They do not.
EM Waves The sound wave is moving through air and the water wave through water. Without matter to transfer the energy, they cannot move. Sound and Water.
Waves, Sound, and Light Chapter 1. Bell Work 1.Name two ways you can apply force to a soccer ball. 2.Name two ways the force you apply can change the.
© Boardworks Ltd 2003 KS4 Waves : Dispersion and Electromagnetic radiation.
29 Reflection and Refraction When waves interact with matter, they can be reflected, transmitted, or a combination of both. Waves that are transmitted.
Quiz Electromagnetic spectrum. Using the quiz … Click through the quiz to see the questions and answers. Remember it is MUCH better to try to think of.
Waves Energy is sometimes transferred from place to place by traveling in waves. Sound and light travel in waves. Some substances transport energy through.
COLOR and Light February 6, How does light interact with matter? O Light can interact 3 ways: O 1. reflected – light waves bounce of objects O 2.
© Boardworks Ltd 2003 Lenses. © Boardworks Ltd (c) Thin converging lens Core Describe the action of a thin converging lens on a beam of light.
What is energy? Energy – is the ability to cause changes in matter. Changing states of matter is a good example. Solid LiquidGas Activity.
Chapter 23. A long, thin light bulb illuminates a vertical aperture. Which pattern of light do you see on a viewing screen behind the aperture? (1) (2)
Refraction and Lenses AP Physics B. Refraction Refraction is based on the idea that LIGHT is passing through one MEDIUM into another. The question is,
April 2011 General Science. Bending Light Thursday April 12 th, 2012 Warm-up: 1. What is the angle of reflection equal to? Objective: Students will be.
1 Light By Mike Maloney. © 2003 Mike Maloney2 Light What is LIGHT? WHERE DOES IT COME FROM?
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