visible light and colour

• What is the main topic of today's video?

  Why objects appear the color they do
• 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 in the visible spectrum?

  Roy G. Biv
• Why are white and black not considered colors on the spectrum?

  White light is a combination of all wavelengths, while black is an absence of light
• What determines the color an object appears?

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

  Objects that do not transmit any light
• How does a gas appear blue?

  It reflects blue wavelengths of light and absorbs others
• How can an object appear yellow?

  By reflecting yellow wavelengths or a combination of red and green wavelengths
• What is the difference between transparent and translucent objects?

  Transparent objects transmit nearly all light, while translucent objects transmit some light
• How does a transparent object like glass behave with light?

  It transmits nearly all light with only a small fraction being absorbed or reflected
• What determines the color of a translucent object?

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

  Because it transmits green wavelengths while absorbing others
• What is the function of color filters?

  To filter out particular colors so that only certain wavelengths can pass through
• What is a primary color filter?

  A filter that only allows one of the three primary colors to be transmitted
• 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 because only the reflected green waves would make it through
• What would happen to a blue object viewed through a green filter?

  It would appear black because the filter blocks the blue light
• What do yellow filters allow to pass through?

  Yellow light and also red and green wavelengths
• What do indigo filters allow to pass through?

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

  • Color appearance depends on light wavelengths and object properties.
  • Opaque objects reflect and absorb light.
  • Transparent objects transmit light.
  • Translucent objects transmit some light.
  • Color filters transmit specific wavelengths while absorbing others.
• What are the differences between opaque, transparent, and translucent objects?

  • Opaque: Do not transmit light; color determined by reflected light.
  • Transparent: Transmit nearly all light; almost see-through.
  • Translucent: Transmit some light; visibility depends on light transmission.
• How do primary color filters differ from other color filters?

  • Primary color filters: Transmit only one primary color (red, green, or blue).
  • Other filters: Transmit their color and combinations of primary colors that make that color.