UV light and Visible light

• What are the two types of light 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 do optical fibers transmit light?

  By reflecting light at the surface
• Why is total reflection important in optical fibers?

  It prevents light from being absorbed
• What is the advantage of using optical fibers over copper wires?

  They transmit more information with less distortion
• What comes after violet in the light spectrum?

  Ultraviolet radiation
• What is a common source of ultraviolet radiation?

  The Sun
• What can ultraviolet radiation from the Sun cause?

  Suntans and sunburns
• How can we generate ultraviolet radiation artificially?

  Using sun beds
• What is fluorescence?

  Absorption of UV light and emission of visible light
• Why do fluorescent paints appear bright?

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

  They convert UV light into visible light
• What is a benefit of using fluorescent bulbs?

  They are energy efficient
• How do security pens utilize UV radiation?

  They mark property invisible until UV light shines
• What is one use of UV radiation in security?

  Marking passports and banknotes
• How does UV radiation help in detecting forgeries?

  It makes invisible marks visible
• What is a final use of UV radiation mentioned in the video?

  Sterilizing water by destroying microorganisms
• What are the main uses of visible and ultraviolet light?

  • Visible light for seeing and communication
  • Ultraviolet light for suntans, fluorescence, and security
  • Optical fibers for data transmission
  • Fluorescent lights for energy efficiency
  • UV radiation for sterilizing water