[edcoil]

why don’t you answer his question and not be a smart ass?

The maximum number in % is 100%. This is the big clue.

Then split -log (%T) in -Log % and -Log T. Replace % with 100.

Log (100) = 2. After that you have A = 2-2-log T. And this becomes A=- log T. Therefore A = -log T.

Do an example by filling T=5.

Then you have 2- log (100*5) = -0.69897 or log (5) is also -0.69897.

Hope this helps.

* 3 years ago

[freedumb2003]

Someone got up on the wrong side of the bed today...

[JRandomFreeper]

I'll bet you didn't use (human readable) log tables or a slipstick. Not with that many decimal points.

/johnny

[paul544]

Thanks. I saw that out there as well. I’ve been trying to use it and think it helps. Appreciate it.

[Vendome]

Geeze edcoil:
It’s Saturday Night and paul544 has been on here long enough to take a razzing.

Probably knew he was going to get a few anyway.

BTW paul544 the answer is log - 42 = %. /s

[bigbob]

Nicely done!

[GunsAndBibles]

Just thinkin’ issues like this probably don’t come up to often over at DU.

[Hoodat]

A can never be negative. Basically,
A = log(100/transmittance percentage)

This can be rewritten as

A = log(100) - log (transmittance percentage)
or
A = 2 - log(%T). Since %T can never exceed 100, A will never be negative. And as %T approaches zero, A approaches infinity.

[CodeToad]

“why don’t you answer his question and not be a smart ass?”

Because, unlike you, this isn’t domyhomework.com and we are not co-dependent and want to be his hero.