Our Perception of Light (for an article)

Seawitch · Feb 1, 2019

I'd like you folks to look at this image below, and then participate in the attached poll:

Which square, A or B, do you think is receiving more light or more light intensity?

This is a famous picture created by Edward H. Adelson at MIT and can be reproduced freely.

@Greg Gdowski

Seawitch · Feb 1, 2019

d2mini · Feb 1, 2019

I voted. But this feels like a trick question.

Mical · Feb 1, 2019

I'm the only one that voted they are receiving the same amount, one is just shadowed by cylinder.

Seawitch · Feb 1, 2019

d2mini said:
I voted. But this feels like a trick question.

It is a trick question, to be addressed in an article over the weekend. ;Smuggrin

d2mini · Feb 1, 2019

Mical said:
I'm the only one that voted they are receiving the same amount, one is just shadowed by cylinder.

Which in my mind makes me think that area is receiving less light.
I look at it from the perspective of my coral. Some do much better in shadow areas of my tank, receiving less light.

lapin · Feb 1, 2019

Funny
No prob if you know your colors

WWIII · Feb 1, 2019

Can't get sunburnt in the shade...

Or can you?

Captain Quint · Feb 1, 2019

I think with the squares being different shades that our mind thinks the shading of A&B just appears different? I voted equal because of this but not certain.

Sarah24! · Feb 1, 2019

Seawitch said:
I'd like you folks to look at this image below, and then participate in the attached poll:

Which square, A or B, do you think is receiving more light or more light intensity?

This is a famous picture created by Edward H. Adelson at MIT and can be reproduced freely.

@Greg Gdowski

Hello,

Well yes this is a trick question but you also have a direct answer if we are just looking at the picture provided. If that is the only variable then A receives more light because you can see that b is in the shadow path. Not only is b in the shadow path other squares with area are as well. In terms of say a front yard the squares are grass and the cylinder is a tree. Usually when the sun hits that tree just right it will cast a shadow on it. Which also comes into to play, what aspect is this diagram in. Because even if it’s a yard with a tree, the shadow won’t always be there and a and b may receive the same amount at times and b could receive more at times I’d the light is placed in certain spots.

Hemmdog · Feb 1, 2019

If the shadow is a true inverse of the light source; it’s not a trick question at all. And this poll is only applicable to lighting reefs using true light source origins. So yea, lol.
They are the same color obviously, but that wasn’t the question.

Crabs McJones · Feb 1, 2019

Voted

A and B are the same color

Hemmdog · Feb 1, 2019

Sarah24! said:
Hello,

Well yes this is a trick question but you also have a direct answer if we are just looking at the picture provided. If that is the only variable then A receives more light because you can see that b is in the shadow path. Not only is b in the shadow path other squares with area are as well. In terms of say a front yard the squares are grass and the cylinder is a tree. Usually when the sun hits that tree just right it will cast a shadow on it. Which also comes into to play, what aspect is this diagram in. Because even if it’s a yard with a tree, the shadow won’t always be there and a and b may receive the same amount at times and b could receive more at times I’d the light is placed in certain spots.

The light doesent move sarahhhh why are you bringing astrophysics into the mix ! Lol

jk

Jacked Reefer · Feb 1, 2019

Well if we were using halides or t5s I don’t think we would even have to worry about the shadow

Sarah24! · Feb 1, 2019

Hemmdog said:
The light doesent move sarahhhh why are you bringing astrophysics into the mix ! Lol jk

Hello,

Because it’s a diffraction of light and it does it regardless lol. We all know that the amount of bending is based upon the wavelength, and the opening it’s going into. It will bend around a stop sign or small tree, but how about a sky scraper lol. If the opening is much larger than the light's wavelength, the bending will be almost unnoticeable. However, if the two are closer in size or equal, the amount of bending is considerable, and easily seen with the naked eye.

But your right this diffraction does actually start in the atmosphere with atmospheric particles. Then further develops because of tiny water droplets in clouds. From there you get all kinds of neat things.

Hemmdog · Feb 1, 2019

Sarah24! said:
Hello,

Because it’s a diffraction of light and it does it regardless lol. We all know that the amount of bending is based upon the wavelength, and the opening it’s going into. It will bend around a stop sign or small tree, but how about a sky scraper lol. If the opening is much larger than the light's wavelength, the bending will be almost unnoticeable. However, if the two are closer in size or equal, the amount of bending is considerable, and easily seen with the naked eye.

But your right this diffraction does actually start in the atmosphere with atmospheric particles. Then further develops because of tiny water droplets in clouds. From there you get all kinds of neat things.

Fifty points griffindor!

Well said Sarah!

tnyr5 · Feb 1, 2019

Technically, as we are all viewing this on screens, they are emitting light lol.

SashimiTurtle · Feb 1, 2019

I know this picture... A looks to be recieving more light, but if you cut the two squares and remove the surrounding picture you will see that both A and B are the same color.