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Chapter 1 – Light

Chapter 1 – Light. Intro to Light. Light:. Is a form of energy that is detected by our eyes Materials with emit light are luminous Ex. Light bulbs, burning match, sun Most objects are non-luminous & don’t emit light Ex. Desks, people, moon. Types of Light Sources:. Incandescent

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Chapter 1 – Light

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  1. Chapter 1 – Light Intro to Light

  2. Light: • Is a form of energy that is detected by our eyes • Materials with emit light are luminous • Ex. Light bulbs, burning match, sun • Most objects are non-luminous & don’t emit light • Ex. Desks, people, moon

  3. Types of Light Sources: • Incandescent • Materials that emit light when heated • Ex. Filament of a light bulb • Luminescent • Materials that produce & emit light energy by a reaction which produces little heat • Ex. Fireflies, Glow sticks

  4. Types of Light Sources: • Fluorescent • Materials that emit light by absorbing high-energy radiation • Ex. Fluorescent lightbulb • Phosphorescent • Materials that “glow in the dark” • Ex. Watches

  5. Transmission of Light: • Light travels in straight lines. • This property of light is called linear propagation • A ray is the path taken by light energy • A beam of light is a stream of light rays • May be parallel, converging, or diverging • A ray diagram uses straight lines with arrows to show the paths of rays of light

  6. Shadows: • An object in the path of light will cast a shadow • There will often be two parts to the shadow: • umbra: area of total shadow • penumbra: area of partial shadow

  7. Ex. Penumbra Light Umbra Penumbra • This is how eclipses work!!!

  8. Try: pg 7 #3 Eclipse of the Sun: Sun Earth Moon

  9. Try: pg 7 #3 Eclipse of the Moon: Sun Earth Moon Moon

  10. Notice anything? Moving the obstacle: • The closer the obstacle to the screen, the less area of penumbra. • Obstacles far from the screen have large area of penumbra.

  11. Forming Images: • An image that can be formed on a screen is called a real image • Ex. film • An image that cannot be formed on a screen is called a virtual image • Ex. reflection in mirror • An image can also be: • uprightor inverted • larger, smalleror same size • A pinhole camera creates an image that is real, inverted & smaller

  12. Ex. Pinhole Camera Pinhole camera Object Image is inverted, smaller & real

  13. The magnification equation: • Magnification: Note: For magn to be large, object must be closer to pinhole than the screen is OR

  14. Ex. Calculate the height of the image of a tree 8m tall & 80m from a pinhole camera that is 20cm long. Also state the magnification

  15. Ex. Calculate the height of a building 300m away from the pinhole that produces an image 3cm high in a pinhole camera 5cm long.

  16. Try: pg 9 #1 & 3

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