Optical phenomenal
Download
1 / 17

Optical Phenomenal - PowerPoint PPT Presentation


  • 126 Views
  • Uploaded on

Optical Phenomenal. Chapter 14 section 3 . Objectives . Predict whether light will be refracted or undergo total internal reflection. Recognize atmospheric conditions that cause refraction.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Optical Phenomenal' - nysa


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Optical phenomenal

Optical Phenomenal

Chapter 14 section 3


Objectives
Objectives

  • Predict whether light will be refracted or undergo total internal reflection.

  • Recognize atmospheric conditions that cause refraction.

  • Explain dispersion and phenomena such as rainbows in terms of the relationship between the index of refraction and the wavelength.


Total internal reflection
Total Internal Reflection

  • Total internal reflection can occur when light moves along a path from a medium with a higher index of refraction to one with a lower index of refraction.

  • At the critical angle, refracted light makes an angle of 90º with the normal.

  • Above the critical angle, total internal reflection occurs and light is completely reflected within


Critical angle
Critical Angle

  • Snell’s law can be used to find the critical angle.

  • Total internal reflection occurs only if the index of refraction of the first medium is greater than the index of refraction of the second medium.


Example
Example

  • Find the critical angle for a water-air boundary if the index of refraction of water is 1.333


Atmospheric refraction
Atmospheric Refraction

  • Refracted light can create a mirage.

  • What is a mirage?

  • A mirage is an optical effect of the atmosphere caused by refraction when light passes from air with one density into air with a different density and the object appears displaced from its true position.

  • The mirage called an inferior mirage occurs when the image appears below the true location of the observed object.

  • During a phenomenon called looming, objects sometimes appear to be suspended above the horizon.

  • Looming is considered a superior mirage because the image is seen above its true position.

  • A mirage that changes the apparent size of an object is called towering.

  • A type of towering, called Fata Morgana, is frequently observed in coastal areas as towering castles that appear out of thin air.


Mirages
Mirages

  • A mirage is produced by the bending of light rays in the atmosphere where there are large temperature differences between the ground and the air.



Dispersion
Dispersion

  • Dispersion is the process of separating polychromatic light into its component wavelengths.

  • White light passed through a prism produces a visible spectrum through dispersion.


Rainbows
Rainbows

  • Perhaps the most spectacular and best known atmospheric optical phenomenon is the rainbow.

  • Sunlight and water droplets are necessary for the formation of a rainbow.

  • Furthermore, the observer must be between the Sun and rain.

  • When a rainbow forms, the water droplets act as prisms and refraction disperses the sunlight into the spectrum of colors, a process called dispersion.

  • The curved shape of the rainbow results because the rainbow rays always travel toward the observer at an angle between 40 and 42° from the path of the sunlight.



Lens aberration
Lens Aberration

  • Chromatic aberration is the focusing of different colors of light at different distances behind a lens.

  • Chromatic aberration occurs because the index of refraction varies for different wavelengths of light.



Video
Video

  • Watch a video


Go over lab
Go over lab

  • Lets go over lab


Homework
Homework

  • Do problems 1-4 pg .502


Closure
Closure

Today we learned about optical phenomena

Next class we are going to have a lab


ad