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# Optical Phenomenal - PowerPoint PPT Presentation

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

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## PowerPoint Slideshow about ' Optical Phenomenal' - nysa

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Presentation Transcript

### Optical Phenomenal

Chapter 14 section 3

• 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 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

• 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.

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

• 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.

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

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

• 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.

• 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.

• Watch a video

• Lets go over lab

• Do problems 1-4 pg .502

Today we learned about optical phenomena

Next class we are going to have a lab