Visible light and colour

• What is visible light made up of?

  A spectrum of different colors
• Which color has the longest wavelength?

  Red
• Which color has the shortest wavelength?

  Violet
• What acronym can help remember the order of colors?

  Roy G. Biv
• Why aren't white and black on the spectrum?

  White is all wavelengths; black is absence of light
• What determines the color an object appears?

  The wavelengths of light hitting it and its properties
• What are opaque objects?

  Objects that don't transmit any light
• How does a gas appear blue?

  It reflects blue wavelengths and absorbs others
• Why might cheese appear yellow?

  It reflects yellow or a combination of red and green wavelengths
• What do transparent objects do?

  They transmit most of the light that hits them
• How do translucent objects differ from transparent ones?

  They only transmit some of the light
• What determines the color of a translucent object?

  The wavelengths of light that are transmitted most
• Why does a green bottle appear green?

  It transmits green wavelengths and absorbs others
• What is the function of color filters?

  To filter out particular colors of light
• What is a primary color filter?

  A filter that allows one primary color to pass
• What happens when white light passes through a green filter?

  Only the green wavelength gets through
• How would white paper appear through a green filter?

  It would appear green
• How would a blue object appear through a green filter?

  It would appear black
• What do yellow filters allow through?

  Yellow light, red, and green wavelengths
• What do indigo filters allow through?

  Indigo wavelengths, blue, and red wavelengths
• What are the key concepts regarding how objects appear in color?

  • Visible light is a spectrum of colors.
  • Color appearance depends on light wavelengths and object properties.
  • Opaque objects reflect or absorb light.
  • Transparent objects transmit most light.
  • Translucent objects transmit some light.
  • Color filters transmit specific wavelengths.
• How do different types of objects interact with light?

  • Opaque: No light transmission, color from reflection.
  • Transparent: Almost complete light transmission.
  • Translucent: Partial light transmission, color from transmitted wavelengths.
• What is the role of primary color filters?

  • Allow only one primary color to pass.
  • Block other colors.
  • Affect how objects appear through the filter.