The Refraction of Light. Using a Ray Box Right now, you will have a chance to observe how rays of light react when passed through a concave or convex.

Slides:



Advertisements
Similar presentations
Refraction.
Advertisements

Refraction (pt 1) Refraction Refraction of Water Waves
Form 4 Physics Next > The study of matter Chapter 5: Light 1.
Refraction D. Crowley, Refraction To be able to apply your knowledge of refraction to explain new situations.
Chapter 15 Pretest Light and Refraction
IGCSE Physics Waves.
Optical Systems make use of Mirrors and Lenses
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.
Reflection.
Refraction occurs at a boundary The speed of light must change at the boundary The angle of the light ray is measured from the normal, as was the case.
Lesson 2: Reflection and Mirrors (page 322) Key Questions: – 1. What are the Kinds of Reflection? – 2. What types of Images Do Mirrors Produce? Sunshine.
Demo: Print: Supplies: pennies, set of styro-cups.
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.
12.7 Natural Phenomena's A Phenomena  an observable event or fact; an object or aspect known through the senses rather than by thought or intuition. Nature.
Refraction. Explore Angle of IncidenceAngle of Refraction 60° 50° 40° 30° 20° 10° 0°
1. How is the index of refraction calculated? How is light refracted as it speeds up? How is light refracted as it slows down? Index of refraction = speed.
Refraction.
Refraction.
Phenomena Related to Refraction. Why do we see images in mirrors? We know that light travels in straight lines Our brains interpret the light that is.
Unit 3 Light and Optical Systems Topic 3 Refraction.
Refraction What do you think? Suppose you are reaching for swim goggles floating below the surface of a pool or trying to net a fish while out in.
Unit – K3 Refraction 25th of May 2007 Form Group 8_y.
5.1 The Ray Model of Light Some properties of light are best described by considering light as a wave. Other properties of light are best described by.
Reflection and Refraction of Light
Refraction of Light When can light “bend”?.
Refraction The bending of waves as they pass from one medium to another.
1. A light ray moving toward the surface of a mirror is…
Science 9 Chapter SOUNDLIGHT REFLECTIONREFRACTION
When Light Bends. Refraction is when waves speed up or slow down due to travelling in a different direction. A medium is something that waves will travel.
Mr. Z’s “Waves” Unit Describe what happens to a wave when it moves from one medium to another AIM: How are wavers refracted?
Refraction D. Crowley, Refraction To be able to apply your knowledge of refraction to explain new situations.
Refraction. Light can bend not only when it reaches a reflective surface but also when it goes from one medium to another Medium (pl. media) –The substance.
Light Section 1. Light Hits an Object When light strikes an object, the light can be reflected, absorbed, or transmitted.
Sound and Light Chapter 4: Light Section 1: Light and Color 3: / 52 = 68.67% 5: / 52 = 82.08% 6: 42.44/52 = 81.62%
2-3 Reflection and Refraction
Analysis for Optics Lab  Choose 6 hypothesis/data sections and analyze the hypothesis and the data 1. Briefly summarize the experimental setup 2. Summarize.
Refractive Index To be able to use Snell’s law to work out the refractive index of a material.
Refraction and the Shadow Zone. Definition of Refraction The change in direction of a wave due to changes in its velocity as it passes from one medium.
Refraction of Light.
Refraction. Reflection When light reflects from smooth surface you can see an image. The image: - is _______ the object. (smaller than, the same size.
L3 Refraction Learning Objectives: Describe refraction.
Refraction Reflection occurs when light rays bounce off object. Using the laws of reflection, the direction in which reflected light travels can be predicted.
Do Now. Refraction is the bending of a wave when it enters a substance where its speed is different.
Refraction When light rays enter and leave different substances they are bent. This is called refraction.
Refraction Refraction is the bending of light when it passes from one transparent medium to another This bending is caused by differences in the speed.
The Refraction of Light. Right now… Open up your the Science Focus 8 Textbooks to page 200 and of the Science in Action handouts. Big Idea: Know.
Reflection Reflection is the process in which light strikes a surface and bounces back off that surface. How it bounces off the surface depends on the.
Table of Contents 9.3 Refraction and Lenses
Unit C: Light and Optics
KS4 Waves : Refraction.
4 - Bending light, Refraction
Refraction Changing of speed of a wave (light) when it travels from one medium to another. When light travels from one medium into another at an angle,
The angle of incidence is equal to the angle of reflection
Ray Model of Light Explains that light travel in straight lines
Refraction Science or Magic?.
Refraction Chapter 4.
Refraction.
Refraction Topic #3.
Refraction through a glass block: Refraction through a glass block:
Prepare to Learn Explain the Physics of the picture you printed for homework to the person next to you. Be prepared to feedback to the whole class.
Refraction.
Refraction.
Refraction.
Light and Optics Section
Phenomena Related to Refraction
Presentation transcript:

The Refraction of Light

Using a Ray Box Right now, you will have a chance to observe how rays of light react when passed through a concave or convex lens. Note - The lenses at each station are Double Concave & Double Convex

Right now… Open up your the Science Focus 8 Textbooks to page 200 We are going to read over the next couple of pages on “Refraction of Light” At the same time, we will be taking some notes and answering some questions on light refraction

Refraction of Light What Does the “Refraction” of light mean? What causes light to refract? Who can explain why light refracts?

What is Refraction Refraction is the bending of light as it changes speeds when it moves from one medium to another The speed of light changes due to the density of the medium which causes the light to bend or refract

Refraction Analogy Imagine winter driving conditions when the road is plowed but the shoulder is covered in deep snow! If one set of tires on one side of your car hit that snowy shoulder, that side of the car slows down and the whole car is sucked (bent) toward the ditch… the same thing happens with light. Also, if the snow in the shoulder is light and dry and only 2 inches deep, will it pull the vehicle off the road as fast if the snow is 12 inches deep and wet & slushy?

What is Refraction? Refraction occurs when light is slowed down by a denser material When one “corner” of a beam of light strikes the denser material 1 st, it is slowed down bending the beam of light toward that corner Normal line

What is Refraction? Please copy down this diagram making note of the normal line, ray of incidence, ray of refraction, angle of incidence, and angle of refraction. Normal line

Density is Key The key to bending light is to change the… DENSITY The more dense the material, the more it will bend the light

If Density Changes? Water = Least Dense Normal Line Soap = More Dense Molasses = Most Dense Normal Line Ray of Incidence

If Density Changes? Water = Least Dense Normal Line Soap = More Dense Molasses = Most Dense Normal Line Ray of Incidence Lowest density = Least Refraction Most density = Most Refraction More density = More Refraction

How does this affect you? When you look at something in the water… are you looking straight at it?

Refraction & Sight If you are trying to grab something in the water, you will need to make an adjustment because of refraction You should be able to diagram where an image of an object appears to be when looking at it from above, and where the object actually is… as well as the angles of reflection and refraction

Angles of Refraction Normal Line A question like this could be worth 8 marks What if I switched the more dense and less dense materials… what would the diagram look like then Less dense More dense

Straight on view How is this fish automatically compensating for refraction?

The other way around By positioning itself straight under the target, there is no “angle” of refraction so the light is not bent and light passes straight through putting the object and the image in the same spot.

Increasing the Angle The greater the angle of incidence, the greater the angle of refraction!

Demo Time Watch what happens as we change the angle we shine it into the tank of water!

What is a Mirage? What is a Mirage and what creates them?

What is a Mirage? A mirage is formed when air near the ground warms… warm air is less dense than cold air… so light is bent As a result, light from the sky directed at the ground is bent upward as it enters the less dense air. The “pools of water” are actually images of the sky refracted by warm air

The Big Idea!!! Refraction of light depends on two things: The DENSITY of the medium The ANGLE the light strikes the medium If you decrease the density… you will decrease how much the light is bent If you decrease the angle of incidence… you will decrease how much the light is bent.

Next Class In the next class we will be completing an investigation into Refraction & Density You will be working with some familiar liquids that have different densities to complete a proper lab report.