What is Refractive Index | Absolute Refractive Index | Optical Density Explained | Grade 10 Physics

What is Refractive Index, Formula Explanation Absolute Refractive Index Optical Density Explained for Grade 10 & 12 Physics.

A ray of light changes its direction when it enters from one medium to another medium. This happens because speed of light is different in different media. For example; the speed of light is 3 x 〖10〗^8 m/s (2.99x〖𝟏𝟎〗^𝟖 m/s) in vacuum and it is 2.98 x 〖10〗^8 m/s in air.
Refractive Index is the extent of change of direction of light in a given pair of media. The refractive index is a relative value of speed of light in the given pair of media. Thus, to calculate the refractive Index the speed of light in two media is taken.
Let the speed of light in medium 1 is v1 and in medium 2 is v2
Therefore; refractive index of medium 2 with respect to medium 1 (n21)
When one medium is taken as vacuum and speed of light is taken in it, then the refractive index of second medium with respect to vacuum is called Absolute Refractive Index and it is generally denoted by n2.
Optical Density: Medium having greater value of refractive index is called optically denser medium, this means light will travel at slower speed in optically denser medium compared to in an optically rarer medium.

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[babitamittal]

We need explanation not someone reading defination for us

[babitamittal]

If i had to read i could have done it by my textbook

[arpu]

Well explained sir👍🏻
Actually u just need to read the passage nd ur way of reading explains everything clearly.🙂
Thank you so much sir😊

[rohanmaharatha]

I think you are just reading the notes from any book .can you explain from you self without using book.

[aaa-xvxe]

It is useful for me because I have missed the online class today so that, now I can understand the concept tq🙂

[clearlywise]

Sir, It's medium instead of media 🙅
I think... 😉

[riteshmishra]

We need a full explanation not for reading definition

[eopanther]

I thought the video was very informative. I have no idea why people need an "explanation" of something that is essentially the answer to a math equation. After he tells you how to get that answer, what is left to explain? It's like asking someone to thoroughly explain the definition of a word. This isn't philosophy.

[tenaciousbrothers]

Are you here to guide us or you expecting answer from us.? What is this?

[mrsheesh]

Very bad quality video. This doesn't explain anything rather just reading a textbook.

[lakshmiorupula]

We need explanation sir .not how to read those sentence .okkkk

[cricketfan]

Teaching needs to be improved sir of yours