... are close together as humans are predatory animals with the human fovea containing only cones for high acuity during daylight. Human eyes only have rods in the periphery of the eye which take around thirty minutes to become adapted to the dark. Rhodopsin is activated with only one photon of light and to blue and green light waves. This is an ... with the time it takes for the sun to set; dusk. When the sun is setting the colours across the sky are shades of red. Red is the only colour that does not photo bleach the rods in the eye. Humans have taken advantage of this adaptive feature by...

• Word Count: 1960
• Approx Pages: 8
• Has Bibliography
• Grade Level: Undergraduate

... coloured objects and our language refers to these objects in a way which imparts the idea of colour as being an integral primary attribute to these objects, ie a blue sky, a red bus and green grass. This view is obviously contrary to the definitions given from the dictionary but highlights the philosophical paradox about the nature of colour. What sort of a property ... a molecular level, as to reflect the emissions of certain wavelengths, e.g. in the case of grass an electromagnetic wavelength of around 500 to 550 nm. These reflected emissions pass into the eye of an observer where, thr...

• Word Count: 1815
• Approx Pages: 7
• Has Bibliography
• Grade Level: Undergraduate