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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.

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11y ago
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2w ago

A light ray typically travels through a glass sheet at a speed of approximately 200,000 kilometers per second. Therefore, a light ray would take around 0.01 microseconds to travel through a 2mm thick glass sheet.

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11y ago

Time = distance / velocity = 3.3 . 10^-3 / ( 3 . 10^8 / 1.5 )

= 1.65 . 10^-11 s

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6y ago

It takes approx 9.8 picoseconds = 9.8 trillionths of a second.

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Q: In how much time a light ray travel through glass sheet of 2mm?
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