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Graded Discussion Board (GDB) for the course PHY101 (PHYSICS) will start on Monday 10th August, 2015.

Graded Discussion Board (GDB) for the course PHY101 (PHYSICS) will start on Monday 10th August, 2015.

You should remember that you have to post your comments about the discussion title within the time.

This discussion board will be closed on Tuesday 11th August 2015.

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The topic for the discussion is:

A student of physics claimed that he calculated a material as having a refractive index of 0.78. Discuss your opinion on this value either possible or not. Justify it by solid reasons."

 Elaborate your answer by giving a solid reason, give mathematical calculation (proof) where necessary.

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Replies to This Discussion

Anyone has any idea regarding this?

I think in normal circumstances, it is not possible to have Refractive index less than unity. Although on certain frequencies it is achievable to have negative Refractive index as well.

Anyone got any proof regarding?

Guys start discussion?

 

koi kr do reply pliz slution send kr do

The speed of light in vacuum is a fixed constant of nature which we usually call c , but in

a medium light can travel slower or faster than . We define the "refractive index" of that medium as:

Refractive index (n)= speed of light in vacuum (c) / Speed of light in material (v).

Usually the values of  n are bigger than one (e.g. for glass it is around 1.5) but in some special media, its value can be less than one. The value of n also depends on the wavelength (or frequency) of light. This is called dispersion, and it means that different colors travel at different speeds inside a medium. This is why; white light gets separated into different colors. The fact that in a glass prism blue light travels faster than red light is responsible for the many colours we see here.

So It is possible to calculate a material as having a refractive index of 0.78. As in special media value can be less than one.

please slution share kro ................................

vacuum is a fixed constant of nature which we usually call , but in a medium light can travel slower or faster than .

Refractive index (n)= speed of light in vacuum (c) / Speed of light in material (v).

Usually the values of  n are bigger than one (e.g. for glass it is around 1.5) but in some special media, its value can be less than one. The value of n also depends on the wavelength (or frequency) of light. This is called dispersion, and it means that different colors travel at different speeds inside a medium. This is why; white light gets separated into different colors. The fact that in a glass prism blue light travels faster than red light is responsible for the many colors we see here.



ye solution he?

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