Reflection vs. Refraction

Slides:



Advertisements
Similar presentations
Refraction of Light.
Advertisements

The spaceship at S wishes to touch the surface of the giant planet and proceed to point X in the shortest distance possible. To what point P on the planet.
ConcepTest 23.1 Reflection
A fish swims below the surface of the water at point P
Waves – Topic 4 Chapters 26 Reflection & Refraction Reflection & Refraction Reflection & Refraction.
Refraction at plane surface and Prisms Dr. M K Raghavendra BASE, Bangalore.
Refraction: Snell’s Law
Refraction of light.
Chapters 28 Reflection and Refraction. Topics Reflection Law of Reflection – plane mirrors – diffuse reflection Refraction – Mirage Cause of Refraction.
When there is a change of medium, a part of the light wave gets transmitted. However, the transmitted part travels with different speed (v) and in a different.
Refraction is the _________ of light when it enters a new medium / material. For example: Light traveling from the cat to our eye must travel through glass.
Optics The light ray model A light ray is a line in the direction that light energy flows. My laser beam for example, is really a bundle of many parallel.
Reflection & Refraction When waves are incident on the boundary between to media, some of the wave will be reflected back into the first medium, some of.
Copyright © 2010 Pearson Education, Inc. ConcepTest Clicker Questions Chapter 26 Physics, 4 th Edition James S. Walker.
Refraction of light. Refraction is the bending of light as it passes from one medium to another.
Refraction What has happened in each example and why? I think this is called...It happens when... It happens because...The air is... The water is...The.
Geometric Optics The Law of Reflection.
sections 26-3 – 26-5 Physics 1161: Pre-Lecture 22 Reflection and Refraction of Light.
Reflection & Refraction of Light Reflection: specular (mirror) vs diffuse angle of incidence = angle of reflection Refraction: Snell’s Law n 1 sin 
Chapter 29 – Reflection & Refraction
Physics. PHS 5041 Optics Refraction of Light Refraction always occurs simultaneously with some partial reflection Change in direction is with respect.
Light by Rifki Irawan Refraction. Based on how the light behaves as it encounters a substance, substances can be classified into: Transparent substance.
Textbook sections 26-3 – 26-5, 26-8 Physics 1161: Lecture 22 Refraction.
Light - Refraction Sec 3 Physics For E-Learning, please read slides 1 to 10.
Refraction and Snell’s Law. Intro to Refraction Take 3 cups from the front, labeled 1,2,3. Observe each straw through the side of the cup as you slowly.
LIGHT REFRACTION OF LIGHT
3 Refraction of light 3.1 Refraction of light 3.2 Laws of refraction 3.3 Snell’s law and refractive index 3.4 Refraction through a block 3.5 Refraction.
Optics 2: REFRACTION & LENSES. REFRACTION Refraction: is the bending of waves because of the change of speed of a wave when it passes from one medium.
Refraction. Reflection & Refraction Refraction Air – lower refractive index Water – higher refractive index The Kingfisher When light is passing from.
Reflection, Refraction, and Diffraction. Reflection  Reflection – wave strikes a surface and is bounced back. Law of Reflection: angle of incidence =
LIGHT REFRACTION TOTAL INTERNAL REFLECTION OPTICAL FIBRES BY : A. Ananda Military School Bangalore.
Reflection and Refraction. Reflection Two laws of reflection Angle of incidence = angle of reflection The angle of incidence, angle of reflection and.
© 2007 Pearson Prentice Hall This work is protected by United States copyright laws and is provided solely for the use of instructors in teaching their.
A laser pointer is aimed at the surface of a flat mirror. Draw the laser beam after it hits the surface of the mirror.
Light Part 2. Reflection Occurs when waves traveling in one media reach a boundary with another media and bounce back into the first medium Total Reflection.
Light Refraction of Light. Learning Objectives You will learn to recall and use the terms used in refraction, including normal, angle of incidence and.
Unit 11 : Part 1 Reflection and Refraction of Light.
Refraction and Snell’s Law Refraction: bending of light at the interface of 2 different materials.
Reflection and Refraction
Chapter 17 Reflection & Refraction. Reflection When light rays bounce back off of a medium boundary.
Chapter 17 Reflection and Refraction. Ch 17.1 How light behaves at a boundary.
Introduction to Light. Light is an EM wave All EM waves travel at the same speed through a vacuum: c = 3 x 10 8 m/s - FASTEST! fast faster.
Refraction & Lenses Chapter 18. Refraction of Light n Look at the surface of a swimming pool n Objects look distorted n Light bends as it goes from one.
Optics Reflection, Refraction & Snell’s Law Lesson 2
Light & Optics. Law of Reflection The angle of incidence of reflected light equals the angle of reflection.  r =  I Note that angles are measured relative.
Refraction (Slowing Down) When a wave passes into a medium that makes it slow down, the wave will bend toward the normal Air Water.
 Simply put, “Refraction” means bends.  When discussing light beams, light bends when it goes from one medium (glass, water, air, etc.) to another. 
Optics Reflection, Refraction & Total Internal Reflection
How Light Behaves at a Boundary
Refraction. Light  Tends to travel in straight lines  If you need to bend light or shine it into difficult-to-reach.
Refraction: bending of light at the interface of 2 different materials.
Mr. Z’s “Waves” Unit Describe what happens to a wave when it moves from one medium to another AIM: How are wavers refracted?
LIGHT Reflection and Refraction. Mirrors and highly polished opaque surfaces reflect light in predictable ways.
What happens when light enters a transparent medium (e.g. water)?
Reflection and Refraction. Reflection Reflection – some or all of a wave bounces back into the first medium when hitting a boundary of a second medium.
How is Light Reflected?. reflection is when light hits a surface and bounces back the “incoming ray” is the incident ray the “outgoing ray” is the reflected.
ConcepTest 23.1Reflection When watching the Moon over the ocean, you often see a long streak of light on the surface of the water. This occurs because:
ConcepTest 23.1Reflection When watching the Moon over the ocean, you often see a long streak of light on the surface of the water. This occurs because:
Wave Behavior of Light Aim: How does light behave when it encounters a new medium?
Reflection vs. Refraction Refraction zRefraction of Light: Bend or change direction z1. As light rays enter a new medium the cause light to bend z2.
Reflection & Refraction Learning Targets: L3: Reflection L4: Refraction – Definition and Ray Dig L5: Critical Angle & Total Internal Reflection L6: Snell’s.
Refraction. Reflection When light reflects from smooth surface you can see an image. The image: - is _______ the object. (smaller than, the same size.
Happy Tuesday! Get ready for warm up #4 Get out paper for notes. Title them: “Snell’s Law and Refraction” Essential Question: What is Snell’s Law?
Notes 23.1: Optics and Reflection
Geometric Optics TEST: 12 April 2016.
Physics: Principles with Applications, 6th edition
Refraction Chapter 14: Section 1.
Refraction of light.
Physics: Principles with Applications, 6th edition
Light Refraction – the “bending” of light as it passes through a surface from one medium to another When light leaves a less dense media such as air and.
Presentation transcript:

Reflection vs. Refraction

Refraction Refraction of Light: Bend or change direction 1. As light rays enter a new medium the cause light to bend 2. The denser the medium – the slower the light travels 3. Index of Refraction: a measure of how much a medium bends the light that travels through it. 4. The faster the beam, it will bend away from normal, the slower the beam, it will bend toward the normal.

A mirage is a visual distortion produced by the refraction of light. Some mirages produce a mirror or a watery image, and others may make an object appear larger or smaller, nearer or further away.

The ray model says… Light has four different ways in which it can interact with matter. Medium 1 Medium 2 Reflection

Light has four different ways in which it can interact with matter. Medium 1 Medium 2 Refraction

Light has four different ways in which it can interact with matter. Medium 1 Medium 2 Scattering

Light has four different ways in which it can interact with matter. Medium 1 Medium 2 Absorption

Reflective Objects

Reflection Diffuse Reflection Regular Reflection Reflection off Paper Reflection off a Mirror

Law of Reflection Normal - an imaginary line drawn perpendicular to the surface

Reflections in a Mirror

Q

An observer observes a light source S in a mirror An observer observes a light source S in a mirror. Where does he perceive the mirror image of S to be located? ●1 ●3 ●4 S ●2

How big does a mirror have to be in order to see your entire length in it? Half His Height!

To see more of her head in the mirror, she … 1. should hold the mirror closer 2. should hold the mirror farther away 3. needs a bigger mirror

Refraction

Refraction As light travels from one medium to another, the speed of light changes and the light bends accordingly. i R

n1 sin I = n2 sinR Snell’s Law: The Law of Refraction Index of Refraction of the media in which the angle of incidence is Index of Refraction of the media in which the angle of refraction is

Index of Refraction Cannot be less than 1.00 Air = 1.00 Glass = 1.5 Water = 1.33

Q

Bruno wishes to “spear” a fish with a laser Bruno wishes to “spear” a fish with a laser. Should he aim the laser beam… above 2. below 3. directly at the observed fish to make a direct hit?

Light is incident on a block of glass as shown Light is incident on a block of glass as shown. Which ray is the refracted ray? 1. 2. 3. 4.

Calculate the critical angle θ from glass (n=1.5) to air. 52.9o 2. 41.8o 3. 32.2o 4. 22.5o 5. 12.3o θ

Calculate the critical angle θ from glass (n=1.5) to air. 52.9o 2. 41.8o 3. 32.2o 4. 22.5o 5. 12.3o θ n1 sin I = n2 sinR 1.5 sin I = 1.0 sin 90 sin I = .667 I = 41.8

Fiber Optics

Fiber optics uses total internal reflection