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Fascinating World of Light: Exploring its Properties and Behaviors

Learn about luminous objects, incandescent light, light spectrum, reflection, refraction, and how light interacts with different materials. Understand the concepts behind absorption, transmission, and reflection of light in this enlightening chapter.

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Fascinating World of Light: Exploring its Properties and Behaviors

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  1. CHAPTER 7 LIGHT

  2. When something produces light, it is said to be luminous. • When visible light is given off as a result of high temperatures, it is said to be incandescent. Ex. Sun, lightbulb, fire • Sun’s surface temperature = 5,700 oC

  3. You already know that: • White light can be separated into 7 colors (ROYGBIV = spectrum) which have different wavelengths. • Red = longer wavelength and lower frequency = refracted the least of all the colors = scattered the least • Violet = shorter wavelength but higher freq. = refracted the most of all the colors = scattered more strongly

  4. Important Facts about Light • Light travels in a straight line until it encounters another object or particles of matter; in which case, it gets: • 1. Reflected if it hits a smooth surface • 2. Transmitted = or Undergoes diffuse refection if it hits a “not-so-smooth” surface • 3. Absorbed by transparent objects.

  5. Transparent Objects – allows light through • Opaque Objects – do not allow light to go through • It is possible for objects to absorb, transmit, or reflect light in varying degrees.

  6. Reflection – when light bounces back • Refraction = when light changes direction at the boundary of two phases as a result of passing through one transparent material to another (like water or air) • Ex. Bending of straw in water

  7. Light slows down when it passes from air to water. Refraction is towards the “incident ray” or the “normal ray.” • Light speeds up when it passes from water to air. Refraction is away from the “incident ray” or the “normal ray.”

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