Malus' law

An explanation of Malus' law, used to calculate the light intensity transmitted through a polarising filter.

[trevorsmith]

This is making so much more sense than my physics text!

[quinntoppolis]

Thank you for the explanation... I was preparing to kidnap my instructor because the text didn't explain this.

[straxsa]

The way my textbook exaplained this idea was so confusing. Thank you for this video!

[shwetai]

Wonderfully concise and easy to follow. Thank you so much!

[Tony-uuhs]

It’s a shame how I understood an explanation from a foreigner teacher and not from my arab ppl. Thank you so much!!

[BobaShark]

Straight to the point explanation. Thank you so much!

[rashedulislam]

thank you so mutch sir.love from Bangladesh

[MAVrikrrr]

Thanks, now I understand why it's cos square. In my tought experiment it was just cos and I was really confused to see cos square in the Malus's law.

[avishekacharyaav]

True legend thanks alot my head was goint to brust you just saved me. I was trying for it to pass through analyzer twice individually and couldn't think of it

[sciencemanguy]

Question about Malus's Law:
Suppose I had 3 filters lined up on the x axis. The first 2 filters follow the exact same principles you outlined above (2nd filter has pheta of 30*), but the third one is now perpendicular to the first filter. As you mentioned earlier in the video, this would result in no light getting through. But here, after we get the 2nd polarised light [the final answer you had at the end of the video], that new plane of vibration is no longer perpendicular to the third filter [when the third filter was perpendicular to the polarized light from the initial polarizre], thus, should produce an intensity that is not 0. But that is not what I see when I experiment with it. What is going on?

[javedfaizal]

Concise and clear- thank you very much!

[bhumikasuniquearts]

Thankyou sir, u made it easy to understand...

[sameeraabida]

Thanks a lot man! Thankyou you so much...

[shteam]

Thank you !
well explained especially the formula for A to I

[kennethcrandall]

Did Malus come up with this law empirically or by analysis?

[yamanyucel]

Is not the Intensity of the incident light halves when passes the first polarizer?

[jacobvandijk]

And replace A by E (= the electric field of light) and you know it all.
Because the polarization of light is determined by the E-field only.

[iplay]

Am I correct to believe this isn't part of the spec for the OCR Physics A Depth Paper tomorrow?