WK2 Reading

• Why is colour considered important in the world?


  It makes the world look more interesting and pleasant.
• Do colourblind individuals see in colour?


  Yes, they see in colour for the most part.
• What biological purpose does colour vision serve?


  It helps animals recognize and distinguish objects in their environment.
• How does the perception of colour relate to physical properties of objects?

  Colour corresponds to some physical property of an object, similar to temperature, which is subjective to how it feels to you unless you use a thermometer to test its objective temp
• What is the distinction made between temperature and sensations of hotness or coldness?


  Temperature is an objective property, while sensations of hotness or coldness are subjective experiences.
• How are sensations of colour similar to sensations of temperature?


  Both are qualities of subjective experience that correspond to physical properties.
• What is one example of how colour vision provides an advantage in everyday life?


  It allows quick recognition of similar objects that differ in colour.
• How does colour vision assist in fruit picking?


  It helps distinguish ripe fruits from unripe ones based on their colour.
• What happens to the visibility of ripe raspberries when viewed in black and white?


  It becomes difficult to see the ripe raspberries and impossible to tell if they are ripe.
• What is one of the most important advantages of colour vision?


  It allows quick identification of objects against different backgrounds.
• How does colour vision help in identifying partially obscured objects?


  It allows linking bits of the same object based on their colour.
• What is the principle behind the Ishihara colour blindness test plates?


  They use dots of various colours to form numbers that can be seen by those with normal colour vision.
• What is the problem with the statement "The light that we see is made up of many different colours"?


  This statement implies that we see light itself, rather than the objects illuminated by light.
• What is the correct understanding of visual perception?


  Visual perception is about seeing objects, surfaces, and events, not light itself.
• Why are colours considered properties of visual experience?


  Because colours are sensations that exist only in the presence of observers.
• What is the relationship between light and colour as sensations?


  Light can evoke different sensations of colour, but colours themselves are not properties of light.
• What is the warning given regarding statements about colour in assessed work?


  Incorrect statements about colour will result in no marks being awarded.
• What should students avoid doing when looking for information about colour vision?


  Students should avoid using Google or other search engines.
• What are the key points about the nature of colour?


  • Colour is a sensation, not a physical property.
  • It corresponds to physical properties of objects.
  • It is subjective and depends on the observer.
  • Misleading statements about colour can lead to confusion.
• What are the advantages of colour vision in animals?


  • Quick recognition of similar objects differing in colour.
  • Ability to distinguish ripe fruits from unripe ones.
  • Enhanced detection of partially obscured objects.
  • Faster identification of objects against varied backgrounds.
• What are the misconceptions about colour and light?


  • Light is not made up of colours.
  • Colours are not properties of light.
  • The colour of an object is not determined solely by the wavelength of light it reflects.
• What is the correct statement regarding light and colour perception?


  • We see objects illuminated by light, not light itself.
  • Colours are sensations evoked by light, not properties of light.
  • Visual perception involves seeing objects, surfaces, and events.
• What is the main claim about light and colors presented in the study material?


  Light is not made up of colors, and colors are not different kinds of light.
• What color does a lemon appear to be, according to the study material?

  Yellow
• What are two examples of colors that do not correspond to any wavelength of light?


  Brown and pink
• How does the study material describe the relationship between light and color?


  It is complex, with light being objective and color being subjective.
• What is the process of perceiving color according to the study material?


  • Proximal stimulation: light reaches the eyes
  • Perceptual processes extract information about distal stimuli
  • Color corresponds to properties of the world
• What is the main source of light mentioned in the study material?

  The sun
• What did Isaac Newton demonstrate about white light in his experiments?


  White light can be split into a spectrum of colors using a prism.
• What is the range of wavelengths that visible sunlight contains?


  400 to 700 nm
• How is the spectrum of visible sunlight represented graphically?


  As a continuous curve with intensity on the vertical axis and wavelengths on the horizontal axis.
• What does the curve representing the spectrum of sunlight indicate about different wavelengths?


  Sunlight contains light of every wavelength within the visible range, but in varying amounts.
• What color does skylight appear to be, and why?


  It appears pale blue because it contains more light of shorter wavelengths.
• How does tungsten bulb light differ from sunlight?


  Tungsten bulb light has a yellowish tint compared to sunlight.
• What is the challenge in predicting the color of a light source from its spectrum?


  Different light sources can appear white despite having different spectra.
• How can colored light sources be created?


  • By filtering white light to remove certain wavelengths
  • By using devices that emit specific wavelengths (e.g., lasers)
• What is a monochromatic light source?


  A light source that contains only a single wavelength.
• What is the wavelength of the light emitted by a Helium-Neon laser?


  632.8 nm
• What are the characteristics of the spectra from different light sources mentioned in the study material?


  • Skylight: more short wavelengths, appears pale blue
  • Tungsten bulb: yellowish tint
  • Fluorescent bulb: nearly white light
• What is a characteristic of a filter in terms of light?


  A filter is seen as coloured.