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can someone check this easy question for me? I think the answer is B but im not sure if it's just D Which part or parts of the eye change the direction of light rays to form an image? the iris both the lens and cornea the lens only the cornea only

Physics
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I can eliminate the iris for you. It's a band of muscles that blocks the light. It's role is not to bend light, even if there is some diffraction at the edges. I believe it's both, but I have to look more! I think B or D. What do you think? The lens is definitely significant.
This might help, but I can't guarantee its accuracy http://img.tfd.com/dorland/refraction.jpg
if as you say, the lens is significant, then im pretty sure that B is right!

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http://www.eyesurgeon.ie/wp-content/uploads/2010/03/Refractive-Surgery-7.gif
If I bet, I'd put money on B. I can't say I'm correct for sure. But it seems likely to me. I can't say the lens is definitely significant.... But I really think it is.
yup b was right!
Cool, thanks! :)
http://www.hsc.csu.edu.au/biology/options/communication/2951/953-2.gif
"In the eye, refraction occurs when light passes from the air to the cornea, from the cornea to the aqueous humor, from the aqueous humor to the lens and from the lens to the vitreous humor. Light spreading out from one point on an object can therefore be focused on a particular point on the retina." http://www.hsc.csu.edu.au/biology/options/communication/2951/CommPart3.html
thank you! :)
You're welcome!

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