901208
| Question | Answer |
| Newton's thoughts on light | That is was a particle like bullets. His experiment had small slits made in paper and then a source was shone on it. He postulated that the light particle would go through the slits as distinct beam and create distinct bands on a surface |
| Young's thoughts on light | light is like waves. Resulting in gradient light on the backing paper |
| Light wave characteristics | Trough and Crest. Trough x trough = positive reinforcement Crest x Crest = positive reinforcement Trough x Crest = negative Crest x Trough = negative |
| Positive reinforcement would result in what? Negative? | It would result in light hitting the back, negative would result in no light (they cancel themselves out) |
| Electromagnetic spectrum | Is the range of different electromagnetic radiation which can exist. Our eyes are sensitive to only a very small small portion of that radiation. 700nm to 400nm. Red is 700nm, violet is 400nm |
| Ultraviolet and inferred light | Are values lower and higher than those we see with our eyes. E.g., Snakes seeing inferred light which eminates off things that are warm. Insects and the falcon things seeing ultraviolet to see the urine of voles |
| 1 nanometre (nm) | 10 to the power of negative 9. 1 billionth of a metre or 1 millionth of a millimetre 1nm = 1millimicron |
| Thre types of species with image forming eyes | Vertebrate, arthropods, Molluscs |
| Imaging from a pin hole camera | Light which is reflected from specific parts off an object are let in through the hole, all other light is excluded, the image is then very sharp but dim |
| larger hole than pin hole | allows more light to enter, however, reflected light from object comes off in more light rays and these are all allowed in the hole, this results in a blurry but bright image. |
| Lens in the pin hole's hole | A lot of light is allowed in, but a convex lens focuses divervent relfected light back onto one point. This makes the image bright and sharp |
| Lenses refract or | bend light |
| at 10m the lens refracts light so that it converges or focuses on a single point. At 100m the image is blurry because? | the rays of light are focused infront of the film or backing and the rays that hit the film have been given space to unfocus again. |
| Solution to the 100m problem? | Change the distance between the lens and the film. This brings the film in line with the point in which the lens has focused the light |
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