Naked Science Forum
Non Life Sciences => Physics, Astronomy & Cosmology => Topic started by: MaciejMarosz on 03/06/2014 16:31:43
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WE ARE INSIDE BUS
.Me
.i
.i
.i -------Bus Vo -------->
.i
.i
.You
OPTION A ( impossible - everything is moving )
I see Your face there where Your face is right now ( fresh position ) ?
.Me
.i
.i
.i Vo = ABSOLUTE ZERO
.i
.i
.You
OR
OPTION B
I see Your face there where Your face was in past ( light need short time for propagation )
.Me.1...Me.2...Me.3
.i
.i
.i -------Bus Vo -------->
.i
.i
.You1...You2...You3
You1 point will be register in Me2 point
************** abc ... photography *******************
> http://www.school-of-digital-photography.com/2012/08/the-inverse-square-law-and-practical.html
Inverse Square Law and Practical Photography
So in the previous article, The Inverse Square Law of Light, we discussed the theory, now let us take a look at how we put what we have learned to practice. We are now clear that the power of the light will be inversely proportional to the square of the distance.
Let us see how the inverse square law affects Exposure.
(https://www.thenakedscientists.com/forum/proxy.php?request=http%3A%2F%2F4.bp.blogspot.com%2F-rru4qw4pj0I%2FUBpdVsFcjuI%2FAAAAAAAAALc%2Fuxku0MhzhfQ%2Fs1600%2Finverse-square-law.jpg&hash=dc650e165d53db389f790018047528ea)
It is clear from the above diagram that the strobe has its maximum output in close ranges, but its intensity falls off quickly as the distance increases.
************** abc ... photography *******************
Ok what is the reason that I see Your face in old position ?
Can I use brightness to evaluate motion ?
different between stationary situation and motion ???
stationary sytuation
SUN -----------------------Earth
motion
p1...p2...p3...p4...p5...SUN -----------------------Earth ------> motion
(https://www.thenakedscientists.com/forum/proxy.php?request=http%3A%2F%2F3.bp.blogspot.com%2F-8wjLt-hPeu0%2FUtvr6OSc5II%2FAAAAAAAABkc%2F4lngY1EJC9o%2Fs1600%2Ftower%2B1.JPG&hash=b5d742f58630fd76435d4d278916f613)
(https://www.thenakedscientists.com/forum/proxy.php?request=http%3A%2F%2F4.bp.blogspot.com%2F-zD3SHCNAlkE%2FUK8ogrlmPiI%2FAAAAAAAAAPk%2FLqngqVuepwI%2Fs1600%2Fe1.JPG&hash=1e0d7f4bde432dd75fb3b29bf587480e)
1930 TOLMAN BRIGHTNESS TEST
right now his test we are using ( hubble )
http://en.wikipedia.org/wiki/Tolman_surface_brightness_test
AUTHOR
MACIEJ MAROSZ ( first test I made in 2012 )
http://tesla4.blogspot.com/