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In how much time a light ray travel through glass sheet of 2mm?
Wiki User
∙ 11y ago
This cannot be answered 100% accurately from the given information. The speed of light in a vacuum is a constant and it travels at approximately 3x10^8 ms.
When light enters a transparent medium it will pass through that medium based on two main factors - it's angle of incidence and the density of that medium, or more correctly expressed, it refractive index. Other factors including temperature and the frequency of the light will alter the result.
We are familiar with some of these factors though we may not have thought about them. A rainbow is produced when light is slowed and spit by the medium of water held in suspension in the air after a shower on a sunny day. The little balls of water are curved so the suns rays strike them at different angles (different angles of incidence) and the frequencies of 'white' light are slowed and split into different colours and frequencies because the water has a refractive index and the angle of incidence changes because of the curved surface.
So back to your question. If we have pure glass it has a refractive index of 1.5 to 1.54. We will also assume that the frequency of the light is not important. This means that light travels 1.5 times faster in a vacuum than in glass or put another way the light will be slowed down by one third.
So the light will travel through the glass at approximately 2x10^8ms
The glass in question is 2mm thick or 0.002m. Dividing one into the other we get roughly 1x10^-11 seconds to pass through or 0.00000000001 seconds!
In fact it would be 0.0000000000999308 seconds at a refractive index of 1.5 with standard sodium D line spectrum light at 90 degree incidence.
Wiki User
∙ 11y ago
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What is a material that light cannot travel through?
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What is transparent and translucent?
A physical thing that is transparent allows light to pass through. Clear glass or plastic, even if tinted, is transparent. You can see objects clearly and with a great deal of detail when looking through something that is transparent. Think of the similarites of the words appearance and transparent. Objects that are translucent allow light to pass through, but the light is so diffused that objects cannot be seen. A sheet of ordinary paper is an example. You can hold a sheet of paper up to a light and you can easily see that light passes through it. but you cannot see with any kind of detail what is behind the paper.
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