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Properties of Light

Properties of Light. Properties of Light summary. Light travels in straight lines Light travels much faster than sound We see things because they reflect light into our eyes Shadows are formed when light is blocked by an object. Laser. Part 1 – Properties of Light.

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Properties of Light

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  1. Properties of Light

  2. Properties of Light summary • Light travels in straight lines • Light travels much faster than sound • We see things because they reflect light into our eyes • Shadows are formed when light is blocked by an object

  3. Laser Part 1 – Properties of Light • Light travels in straight lines:

  4. Thunder and lightning start at the same time, but we will see the lightning first. • Light travels much faster than sound. For example:

  5. Nanometer is one billionth of a meter – Think about cutting a meter stick into a billion pieces… Atoms and molecules, the smallest pieces of everything around us, are measured in nanometers. A typical germ is about 1,000 nanometers. We can measure even larger things in nanometers, so a hair is about 100,000 nanometers wide. That is a lot of nanometers! Shaquille O’Neal, a very tall basketball player, is 2,160,000,000 nanometers tall.

  6. We see things because they reflect light into our eyes: Homework

  7. A luminous object is one that produces light. A non-luminous object is one that reflects light. • Luminous and non-luminous objects Luminous objects Reflectors

  8. Rays of light Shadows are places where light is “blocked”: • Shadows

  9. Reflection • Reflection – some or all of a wave bounces back into the first medium when hitting a boundary of a second medium • When all the wave energy is reflected back instead of being transmitted, it is total reflection • If some energy is transmitted and some is reflected, the wave is partially reflected

  10. Reflection • Reflection from a mirror: Normal Reflected ray Incident ray Angle of reflection Angle of incidence Mirror

  11. Angle of incidence = Angle of reflection • The Law of Reflection In other words, light gets reflected from a surface at ____ _____ angle it hits it. The same !!!

  12. Reflection

  13. Reflection of Light

  14. Reflection of Sound

  15. 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

  16. Refraction

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