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A Question About Eyesight  
User currently offlineHorizonGirl From Canada, joined Mar 2005, 807 posts, RR: 16
Posted (7 years 2 months 1 week 3 days 22 hours ago) and read 1572 times:

Hello everybody!

I know this may seem like a strange question to be asking, but something has been
bugging me lately. Last year in grade 10, we were talking about how our eyesight
works in science. We learned that coloured objects appear that colour because they absorb
all colours of light, except they reflect the one colour they don't absorb.
The object is the colour of light it reflects. Black absorbs all colours of light.
Are our pupils black so they can absorb all colours of light?
And if they were another colour, say, blue, would we not be able to see that colour because
our eyes couldn't absorb it?
Hopefully this makes a little sense!


Devon


Flying high on the Wings of the Great Northwest!
5 replies: All unread, jump to last
 
User currently offlineIamcanadian From Canada, joined May 2001, 734 posts, RR: 1
Reply 1, posted (7 years 2 months 1 week 3 days 22 hours ago) and read 1560 times:

Quoting HorizonGirl (Thread starter):
Are our pupils black so they can absorb all colours of light?

Like any other object that has colour, the pupils aren't actually "black", rather, they appear black because they absorb all/most colours of light.  smile 

If you need any more questions answered, you can always Wiki it.



Shut up and calculate.
User currently offlineYellowstone From United States of America, joined Aug 2006, 3071 posts, RR: 4
Reply 2, posted (7 years 2 months 1 week 3 days 22 hours ago) and read 1559 times:

Your pupils appear black for the same reason that, if you poke a small hole in a box and look through it, the inside will look black, whatever color it actually is. The pupil is transparent, and not enough light gets through to illuminate the inside. That's why doctors have that device to shine a light into your eye, so they can take a look in through your pupil.


Hydrogen is an odorless, colorless gas which, given enough time, turns into people.
User currently offlineHorizonGirl From Canada, joined Mar 2005, 807 posts, RR: 16
Reply 3, posted (7 years 2 months 1 week 3 days 22 hours ago) and read 1554 times:

Thanks for your responses, makes a lot more sense now.  Smile

Devon



Flying high on the Wings of the Great Northwest!
User currently offlineAloges From Germany, joined Jan 2006, 8693 posts, RR: 43
Reply 4, posted (7 years 2 months 1 week 3 days 17 hours ago) and read 1517 times:

Quoting Yellowstone (Reply 2):
The pupil is transparent, and not enough light gets through to illuminate the inside. That's why doctors have that device to shine a light into your eye, so they can take a look in through your pupil.

 checkmark  What they see with that is the back of the eye, I'd call the colour yellow-ish. And then you have the blood vessels.



Walk together, talk together all ye peoples of the earth. Then, and only then, shall ye have peace.
User currently offlineRedngold From United States of America, joined Mar 2000, 6907 posts, RR: 45
Reply 5, posted (7 years 2 months 1 week 3 days 9 hours ago) and read 1463 times:

Quoting HorizonGirl (Thread starter):
Are our pupils black so they can absorb all colours of light?

There is a layer in the retina which is black. It is very thin, so when you shine a strong light into it, you see the blood vessels and the fatty layer behind this layer. If you were to open up an eye, the retina would appear black. (I've done this type of dissection on a cow's eye.)



Up, up and away!
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