Visible and UV light

• What types of light are discussed in the video?

  Visible and ultraviolet light
• How does visible light appear different colors?

  It depends on the wavelength
• What is the order of colors in visible light?

  Red, orange, yellow, green, blue, indigo, violet
• What does the phrase "boy G bit" help to remember?

  The order of colors in visible light
• How is visible light used for communication?

  Through optical fibers transmitting light pulses
• What are optical fibers made of?

  Thin glass or plastic fibers
• How does light travel through optical fibers?

  It reflects and bounces back and forth
• What is required for effective light transmission in optical fibers?

  Materials that totally reflect light
• What is the advantage of using optical fibers over copper wires?

  They transmit more information with less distortion
• Where does ultraviolet radiation fall on the spectrum?

  After violet
• What is a common source of ultraviolet radiation?

  The Sun
• What is fluorescence?

  Ultraviolet light absorbed and emitted as visible light
• Why do fluorescent paints appear bright?

  They emit light after absorbing ultraviolet light
• How do fluorescent lights work?

  They generate UV radiation absorbed by phosphorous
• What is the benefit of using fluorescent bulbs?

  They are energy efficient
• How can ultraviolet radiation be used for security?

  With special pens that mark invisible codes
• What is one application of UV radiation in detecting forgeries?

  Marking property and banknotes
• How does UV radiation sterilize water?

  It destroys microorganisms
• What are the main uses of visible and ultraviolet light?

  • Communication via optical fibers
  • Fluorescence in paints and lights
  • Security marking with UV pens
  • Sterilization of water
• What are the differences between visible light and ultraviolet light?

  • Visible light: Can be seen, varies in color
  • Ultraviolet light: Invisible, shorter wavelength than visible light