4.6 Refraction.

Slides:



Advertisements
Similar presentations
Refraction.
Advertisements

Total Internal Reflection. Remember – when light goes from a more dense medium to a less dense medium it speeds up & bends away from the normal Remember.
Chapter 15 Pretest Light and Refraction
Refraction of light. Refraction is the bending of light as it passes from one medium to another.
12.1 Refraction Mr. Dvorsky SNC2D1. Review of last chapter From the last chapter, we know how light behaves when it travels in space or in the air – i.e.
Refraction.
REFRACTION (Bending of Light) Light slows down or speeds up when it enters and leaves another material.
Refraction. The Optical Density of a Medium The better a medium transmits light, the lower its optical density. The slower light is transmitted by a medium,
Refraction When light passes from one medium to another, it bends.
Refraction.
Refraction and Snell’s Law Refraction: bending of light at the interface of 2 different materials.
How Light Behaves at a Boundary
Refraction.
12.1 Refraction.
LIGHT Reflection and Refraction. Mirrors and highly polished opaque surfaces reflect light in predictable ways.
The Refraction of Light SNC2P – Optics. Refraction Refraction: the bending or change in direction of light when it travels from one medium into another.
{ Refraction The bending or change in direction of light when it travels from one medium into another.
12.1 What is Refraction?.  The bending or change in direction of light when it travels from one medium to another.
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?
Refraction The Bending of Light. What is Refraction? Light travels in straight lines in one material. When light travels from one material (medium) to.
Partial Reflection and Partial Refraction: Refraction is often accompanied by reflection –i.e. when light hits a surface, some of it may pass through.
Refraction Light moving from one medium to another will bend towards or away from the normal, depending on the speed of light in the second medium.
PW3 - Refraction.  When light passes from glass into air (an optically less dense medium), it refracts away from the normal.
The Critical Angle and Total Internal Reflection.
Notes 23.1: Optics and Reflection
Do Now: Light passes from air into some corn oil used for baking. What is the velocity of light in corn oil? How does this compare to light in glycerol?
Learning Objectives to calculate the index of refraction
L13 Putting All Refraction Together Answers to Student Notes Less to Dense and Back Again, Lateral Displacement Big Fish Bent Pencils Total Internal.
Wave Properties of Light
Refraction Chapter 14: Section 1.
Reflection and Refraction of Waves
Reflection and Refraction
Review of Snell’s Law & Refraction Calculations
Grade 11 Physical Science – Mrs KL Faling
Refraction when light passes from one material (aka medium) to another, it bends because the speed of light travels at different speeds in different mediums.
Refraction.
APPLICATIONS OF REFRACTION AND TOTAL INTERNAL REFLECTION
Refraction.
Refraction.
The angle of incidence is equal to the angle of reflection
Refraction - at the air-glass boundary
Total Internal Reflection
Total Internal Reflection
Refraction Science or Magic?.
Speed of light The speed of light is 3.0 x 108 m/s in a vacuum
Refraction and Snell’s Law
Refraction The bending of light.
Learning Objectives To observe and explain the phenomenon of refraction.
Refraction.
Refraction.
Refraction phenomena and applications
Lesson 17 Key Concepts and Notes
Refraction of light.
Warm-up: The index of refraction for acetone is 1. 36
Wave Behaviors We will discuss different manners in which a wave can behave when it comes in contact with matter or other waves!
Plane Mirror – Reflection
Refraction.
Chapter 14 Refraction.
Refraction.
____ _______ _________.
Total Internal Reflection
Physics Review Refraction Topic Slides Minutes Displacement Vectors
Refraction.
Refraction The bending or change in direction of light when it travels from one medium into another.
Chapter 11 Refraction.
Refraction The bending of light.
The Index of Refraction
Adv Physics Chapter 22 Sections 3 and 4.
Lesson Two The Index of Refraction & Total Internal Reflection
Light wave is coming out of page
Presentation transcript:

4.6 Refraction

Penny Demo

Magic?

Refraction Bending of light as it passes from one medium into another Why? The speed of light is: 3.00 x 108 m/s in a vacuum 2.26 x 108 m/s in water 1.76 x 108 m/s in acrylic

Rules Light bends TOWARDS to normal when the speed decreases Light bends AWAY from normal when the speed increases (up up and away!)

incident ray MEDIUM #1 MEDIUM #2

incident ray MEDIUM #1 MEDIUM #2

incident ray MEDIUM #1 MEDIUM #2

Sample Question If I had a beam of light passing from a water medium to an acrylic medium, would the light bend towards or away from the normal?

Sample Question If I had a beam of light passing from a water medium to an acrylic medium, would the light bend towards or away from the normal?

Angle of Refraction The angle between the refracted ray and the normal (Add this to your diagram)

Partial Reflection and Refraction Some light that hits a surface refracts into the new medium Some of the light is reflected back into the same medium Ex. two way mirrors and mirrored sunglasses

Total Internal Reflection

Critical Angle Angle of incidence increases causing angle of refraction to reach up to 90º. critical angle: the angle of incidence that produces a refracted angle of 90º

Total Internal Reflection total internal reflection: angles greater than the critical angle causing incident ray to be reflected back into same medium DEMO

Summary: Two conditions for total internal reflection: Light must be travelling slower in the first medium compared to the second The angle of incidence must be large enough that no refraction occurs in the second medium

Applications: Diamonds: very high n, therefore very small critical angle, therefore lots of total internal reflection = sparkle Fiber Optics: light travels along glass cable

Triangular prisms: used in optical devices such as cameras and binoculars since they do not deteriorate like the reflective film in mirrors.

Retro reflectors: cut off from corner of cube- used to send light back parallel to incident light. Use on moon, bike reflectors and road signs.