Hello Nadeen,
This is an area that fascinates me, so your post caught my eye. To deal with the formula you quoted first: "v =x/t therefore t = x/v".
v represents velocity (i.e. speed in a given direction), x represents displacement, and t represents time.
This is more or less the same formula as...
Yes, thanks for taking the trouble. If I hadn't had my gestalt moment I would still be going round in circles, so your answer would have put me out of my misery :-)
Can't believe I didn't realize this before. I forgot to take Lambert's cosine law into account - the size of the area seen by an observer tends to zero as the obeserver's position approaches 90 degrees from the normal (cosine 90 = 0). Doh! So yes, it's pi and not 2 x pi.
Hello,
(I think I put this in the wrong place before)
I know this was a couple of years ago but I hope you can clear up some confusion. You appear to be saying that the luminance emitted by a surface from a perfectly diffuse surface, in relation to the illuminance incident on that surface, can...
Thanks Tom,
My interpretation of this definition is that luminance is the luminous intensity from an infinitessimally small area (i.e. a point) in candelas divided by the orthagonal projection of this area. Since for a Lambertian (perfectly diffuse) surface the light is reflected through all...
Hello,
I know this was a couple of years ago but I hope you can clear up some confusion. You appear to be saying that the luminance emitted by a surface from a perfectly diffuse surface, in relation to the illuminance incident on that surface, can be defined as follows:
luminance = incident...