Refraction.

Slides:



Advertisements
Similar presentations
Chapter 29 Reflection and Refraction
Advertisements

Refraction (pt 1) Refraction Refraction of Water Waves
Chapter 15 Pretest Light and Refraction
Chapter 29 Reflection & Refraction May 27 – 30 Mr. Gaydos.
Refraction of Light Light changes direction (bends) as it crosses a boundary between 2 media in which the light moves at different speeds. Amount of refraction.
Chapter 29 – Reflection & Refraction
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.
Reflection and Refraction of Light
Reflection and Refraction Chapter 29. Reflection Reflection – some or all of a wave bounces back into the first medium when hitting a boundary of a second.
REFRACTION (Bending of Light) Light slows down or speeds up when it enters and leaves another material.
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.
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.
Ch. 17 Reflection and Refraction
Mirror and Lens Notes.
Reflection and Refraction
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.
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. 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,
Optical Phenomenal Chapter 14 section 3. Objectives  Predict whether light will be refracted or undergo total internal reflection.  Recognize atmospheric.
Unit 11 : Part 1 Reflection and Refraction of Light.
15.3 Optical Phenomena pp Mr. Richter.
Ch. 17 Reflection and Refraction Milbank High School.
Refraction: TIR and Dispersion AP Physics: M. Blachly Light and Optics.
Reflection and Refraction
Chapter 17 Reflection & Refraction. Reflection When light rays bounce back off of a medium boundary.
Reflection Lab What is the relationship between the angle in and the angle out for light on a mirror?
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.
Refraction of Light Refraction and Lenses
.. What Happened?? Look at the data you collected during the simulation Are the angles the same for every scenario? Why is there a difference?
Refraction -Refraction of Sound -Refraction of Light.
1 By Mike Maloney © 2003 Mike Maloney2 Light as a Ray Light very often travels in straight lines. We represent light using rays, which are straight lines.
Refraction. Light  Tends to travel in straight lines  If you need to bend light or shine it into difficult-to-reach.
EFFECTS OF REFRACTION.
Refraction The bending of light due to a change in speed.
Refraction of Light Refraction Refraction –Refraction occurs when light waves traveling from one medium to another with a different density bend. –The.
Applications of Reflected and Refracted Light
Refraction of Light When you shine a narrow beam of light at the surface of a piece of glass, it bends as it crosses the boundary from air to glass. The.
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.
Light In this unit: 1)Properties of light 2)Reflection 3)Refraction 4)Absorption 5)Colors.
Mirrors and Refraction Chapter , Mirrors If a candle flame is placed in front of a plane (flat) mirror, rays of light from the candle.
Reflection and Refraction. The Law of Reflection – incident rays and reflected rays make equal angles with a line perpendicular to the surface called.
-Atmospheric Refraction -Total Internal Reflection
Chapter 17 Reflection and Refraction. When light passes from one medium to another it may be reflected, refracted or both.
The Critical Angle and Total Internal Reflection.
A farsighted person’s cornea and lens focus images behind the retina
Reflection and Refraction
Refraction and Lenses.
Table of Contents 9.3 Refraction and Lenses
Reflection and Refraction
LIGHT.
Refraction Chapter 14: Section 1.
Reflection & Refraction
Reflection and Refraction
Reflection and Refraction
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,
Refraction and Snell’s Law
The Refraction of Light
Phenomena Related to Refraction
Reflection and Refraction of Light
The law of reflection: The law of refraction: Image formation
Refraction Phenomena including Total Internal Reflection
Refraction.
Refraction Optical Phenomena.
REFRACTION AND INTERNAL REFLECTION
Refraction of Light (between mediums)
Refraction Optical Phenomena.
Refraction.
Adv Physics Chapter 22 Sections 3 and 4.
Phenomena Related to Refraction
Presentation transcript:

Refraction

Refraction Refraction – the change in direction of a wave as it crosses the boundary between two media in which the wave travels at different speeds Wave Fronts – lines that represent the position of different crests At each point along a wave front, the wave is moving perpendicular to the wave front The direction of motion is best represented by a ray

Refraction

Refraction of Sound Sound waves are refracted when parts of a wave front travel at different speeds This happens in uneven winds or temperatures Sound waves tend to bend away from warm ground, since it travels faster in warmer air On a cold night, the speed of sound is slower near the ground than above, so we can hear over larger distances

Refraction of Sound

Refraction of Light A pond or swimming pool may appear shallower than it actually is.

Refraction of Light A pencil in a glass of water will appear bent

Refraction of Light An object can appear in a completely different place when perceived through two different media.

Refraction of Light The air above a hot road seems to be moving due to the difference in densities of hotter and cooler air.

Refraction of Light All of these effects are caused by changes in the speed of light as it passes from one medium to another, or through varying temperatures and densities of the same medium – which changes the directions of light rays

Refraction of Light

Atmospheric Refraction On hot days there may be a layer of very hot air in contact with the ground, the light will travel faster through this air and will bend, creating a mirage When you watch the sun set, you can still see the sun for several minutes after it has sunk below the horizon, because light is refracted by Earth’s atmosphere

Dispersion in a Prism Light of frequencies closer to the natural frequency of the electron oscillators in a medium travels more slowly in the medium Since different frequencies of light travel at different speeds in transparent materials, they will refract differently and bend at different angles When light is bent twice at nonparallel boundaries, as in a prism, the seperation of the different colors is apparent Dispersion – the separation of light into colors arranged according to their frequency

Dispersion in a Prism

Dispersion in a Prism

The Rainbow The rainbow takes the concept of dispersion and multiples it through the atmosphere The sun shines on water droplets in a cloud or when it is raining The light is dispersed by the raindrop into its spectral colors

The Rainbow

Total Internal Reflection Critical Angle – the minimum angle of incidence for which a light ray is totally reflected within a medium Total Internal Reflection – the 100% reflection of light that strikes the boundary between two media at an angle greater than the critical angle Optical fibers utilize the concept of total internal reflection to feed light from one location to another, these cables are very useful for communications

Total Internal Reflection

Index of Refraction (n)

Snell’s Law Snell’s Law: n1 sin θ1 = n2 sin θ2 (where n1 and n2 are the indices of refraction of the media on either side of the boundary, and θ1 and θ2 are the respective angles of incidence and refraction)

Practice Problem 1 Light travels from air (n=1.00) into water (n=1.33). If the angle of refraction is 30.0o, what is the angle of incidence?

Practice Problem 2 A ray of light in air (n=1.00) strikes a block of quartz at an angle of incidence of 30o. The angle of refraction of refraction is 20o. What is the index of refraction of the quartz?