is the world really upside down?

[Space cat]

Can someone else explain basic optical principles to Micky???

A demonstration might be more effective. Take a standard magnifying glass into a room in which the only light is from a window and hold it close to the wall opposite that window. If you hold it at the right distance from the wall, you will get an image of the window projected onto the wall - and it will be upside down.

A single convex lens - which is what you have in your eye - will always do this. There is no way to make that magnifying glass project the image onto the wall the right way up. Try it and see.

 

[securespark]

Our brains adjust to the visual input.

They even adjust to take account of double vision, but only up to a point...

 

[lifesagasman]

Beauty is in the eye of the beholder.

Get it out with Optrex.

 

[conny]

Beauty is in the eye of the beholder.

Get it out with Optrex.

MODS!!!

Advertising!!!

 

[joinerjohn]

Our brains adjust to the visual input.

They even adjust to take account of double vision, but only up to a point...

I get double vision quite regularly

Usually on Friday nights, around 11:30 pm.

 

[Mickymoody]

Can you really take basic optics, and translate that to the function of a human eye? Can you translate that to how an animal with eyes on each side of its head operates? How a fly sees?

The only way to disassemble this is to understand how the human brain works, and we ain't there yet. So you can make no assumptions.

Explain why the sky appears blue, when in fact it is clear? Explain why clothing is dyed blue, but appears white?

 

[joinerjohn]

Mickey, the OP was asking about the human eye, not the brain. He's not asked why the sky is blue or why a tinge of blue seems to make whites whiter.
Once you take the brain into account, your in a different realm altogether. Different people perceive colours slightly differently from each other (and there is a standard test for that too).
We have explained how the human eye works at a basic optical level. Be satisfied with our answers.

 

[ColJack]

they sky appears blue because the light from the sun passes through the gasses and some of it gets absorbed but the blue end of the spectrum gets through more than the red end..

white things dyed faitnly blue look whiter because of the same thing..
there's more blue in the light getting through so more light is relfected by the slightly blue whites.

 

[Mickymoody]

Mickey, the OP was asking about the human eye, not the brain. He's not asked why the sky is blue or why a tinge of blue seems to make whites whiter.
Once you take the brain into account, your in a different realm altogether. Different people perceive colours slightly differently from each other (and there is a standard test for that too).
We have explained how the human eye works at a basic optical level. Be satisfied with our answers.

Is the human eye not connected to the brain then? Oh.

Coljack you win the prize. White is blue because the human eye cannot detect.