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Phenomena Related to Refraction

Phenomena Related to Refraction. Apparent Depth. The depth that an object in water appears to be shallow due to the refraction of light. Apparent Depth. Objects in water appear to be closer than what they actually are. A fish will be deeper in the water than it appears to be. Why??.

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Phenomena Related to Refraction

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  1. Phenomena Related to Refraction

  2. Apparent Depth • The depth that an object in water appears to be shallow due to the refraction of light.

  3. Apparent Depth • Objects in water appear to be closer than what they actually are. • A fish will be deeper in the water than it appears to be.

  4. Why?? • Your brain projects the light rays backwards in a straight line to create a virtual image in the water.

  5. Virtual Images and Apparent Depth • The virtual images projected by our brains are shallower than they actually are…. • apparent vs. actual depth.

  6. The Flattened Sun? • How does the sun appear to change shape??

  7. The Flattened Sun • The Sun looks flattened during sunset as light from the bottom of it is refracted more than the top. • The air is more dense near the surface of Earth compared to higher air which bend the sun’s rays.

  8. Light from the bottom of the sun is refracted more than the top. • The air is more dense near the surface of Earth compared to higher air which bend the sun’s rays.

  9. The Flattened Sun!

  10. Mirages can occur if hot air is close to the surface of Earth and there is cooler air above it. The result is an image in a different spot than an object. The cold air is more dense, which causes the speed of light to be slower than in hot air. Mirages do exist, they simply show an image at a location which the actual object is not there. Mirages • Hot air close to the surface of Earth with cooler air above it → mirage.

  11. Mirages • The result is an image in a different spot than an object. • The cold air is more dense, which causes the speed of light to be slower than in hot air.

  12. Mirages • Show an image at a location but the actual object is not there. • Due to the refraction and total internal reflection in Earth’s atmosphere.

  13. Mirage • The appearance of water on the earth’s surface where there is no water. • The pool of water is virtual image of the sky on the hot surface of the earth.

  14. Mirage!

  15. Shimmering Moon • Multiple reflections?? • Shimmering occurs as light travels at slightly different speeds due to air layers of different temperatures.

  16. Light Dispersion • The separation of white light into its spectrum of colours. • Note violet light slows down more than red light.

  17. Light Dispersion • Dispersion can produce a rainbow. A light ray will undergo three changes in direction when it interacts with a raindrop to form a rainbow. • Refraction and dispersion occurs as the light goes from air to water. • Partial internal reflection occurs as the light hits the back of the water drop. • Refraction occurs as the light goes from water to air.

  18. Light Dispersion • Dispersion. • Reflection. • Refraction.

  19. Vocabulary and Homework! Apparent Depth Mirage Dispersion Pg. 539 # 1 - 7

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