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Martin, Engineer
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# Unpolarized light with intensity 420 passes first through

Unpolarized light with intensity 420 passes first through a polarizing filter with its axis vertical, then through a polarizing filter with its axis 23 from vertical. What light intensity emerges from the second filter?

This is known as the Malus law and i will assume perfect polarizer here. The unpolarized light intensity will divide by 2 after the first filter.

After, I = I0 cos^2 teta

I = Intensity after passing the second filter

I0= Intensity between the 2 filter

Teta= angle between the light polarization before the second filter compared to the polarization angle of the second filter.

So, the intensity at the end is 210 cos^2 (23) = 118.

If you replace the angle by 0, you are parallel, so it will give 210 (no attenuation). If you use 90, it will give 0, (complete attenuation).

Customer: replied 7 years ago.
My pleasure. Feedback are always welcome.
Customer: replied 7 years ago.
What information do you need?
Customer: replied 7 years ago.
The answer has to be in mV.
None, all is fine, i just use "info request" so that customers don't click 2 times on accept. I was just mentioning that it's possible to let feedback after you accept an answer. Not an obligation, just nice when someone does.

As for the mV (millivolt?) i don't know how this apply. Light intensity unit is the candela.
Customer: replied 7 years ago.
Are you trying to answer the second question about the magnetic field.
Customer: replied 7 years ago.