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Reader questions and feedback on physical science. Also refer to physics, chemistry, astronomy, electricity, magnetism, electromagnet, light, sound, waves, forces, work, energy, friction, heat, thermodynamics, Ron Kurtus, School for Champions. Copyright © Restrictions Answers to Readers' Questions on Physical Science:Refraction of LightThe following 4 comments and questions have been sent in. They are listed according to date. List of first 10 items
What causes light to slow down in a transparent medium?QuestionJanuary 31, 2009 What would cause light to slow down on entering a transparent medium? If it did, what would cause it to speed up again upon exiting the medium? Once something is slowed down does it not stay slowed unless acted upon by some outside force? Robert - USA 17190 AnswerLight is an electromagnetic wave that has a certain speed in space. When it passes through a transparent material like air, the electrical fields of the atoms in air slow it down only slightly, because they are so far apart. When light passes through a transparent material like glass, the electrical fields of the its atoms slow the light down considerably. Once the light gets back into air, it increases its speed, since it is not longer held back by those electrical fields. Why isn't light bent when perpendicular to the surface?QuestionOctober 23, 2007 A ray of light ebtering the second medium perpendicularly through the surface of separation shows no change in direction? Amna - Saudi Arabia 14624 AnswerThink in terms of a beam of light consisting of many parallel rays. Each affects the ones next to it. When a beam of light enters another medium at an angle, the first part to enter the medium changes speed and is bent by the effect of the other. But when enters perpendicular, there is no change in direction. Explained mechanism why light bendsQuestionDecember 16, 2006 Excuse me sir , i have great dout in bending of light.why the angle or direction of light is changing, when light is passing from air to glass.what is the reason to change the path direction? please don't say this is property of light. please give the answer ,i like to know about this very briefly, if any mechanism was there ,please send me sir baskar - India 12636 AnswerLight travels slower in glass than it does in the air. When a beam of light hits a pane of glass at an angle, the light progressively slows down as it enters the glass, thus changing the angle at which it is traveling. How does light return to it original speed?QuestionOctober 23, 2006 Light slows as it passes through water or glass, causing it to bend, but how can it return to light-speed on its own once it exits? - USA 12227 AnswerIt is like driving from the pavement into a muddy road and then back to the pavement. When there is little or no matter, light travels at a given speed. When the light travels through matter such as glass, the material's electrical fields slow down the speed. Once it leave the material, it resumes its natural speed. SummaryHopefully, this reader feedback has helped provide information about Science issues. ResourcesThe following are some resources on this topic. WebsitesBooks
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