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| Posted By: simon (gcse a level physics) Posted On: Aug 23, 2006 Views: 1314 | An error in Keith's text "Examination of the beam of light shows that it is narrower at the bottom than the top, suggesting that the source is on the ground" your probably write but light can be convergent as well as divergent so it could come from the cloud but be focused on the ground. the lighting of the rest of the cloud could simply be leakage from part of the thing generating it i mean like a projector leaks light. |
| Posted By: Keith Mayes Posted On: Aug 24, 2006 Views: 1311 | RE: An error in Keith's text I wasn't aware I had made an error. What I said was "Examination of the beam of light shows that it is narrower at the bottom than the top, suggesting that the source is on the ground" . Please note the word "suggesting". There is nothing wrong with my statement. There is no error. I think you owe me an apology. |
| Posted By: Bill Cooper Posted On: Aug 26, 2006 Views: 1306 | RE: An error in Keith's text If I may step in here, there is an element of truth that the beam may by going up or down, BUT for there to be light leakage, I'd bet that you would see 'shadows' and a variation in the light. If you look, you can see that the diffuse light in the cloud 'dissipates' outward. all around evenly. If the light were being directed down I think we would see the source, rather like being off beam of a torch, you are not 'in the beam' but you may see the 'bulb' An astute observation Simon, but in this case I'm afraid optics (as we know it) puts this one as eminating from the ground. |
| Posted By: Your English tutor Posted On: Mar 13, 2008 Views: 1109 | RE: An error in Keith's text well well well Simon...you aren`t aware of the errors in your text either are ye,Jim lad ? |