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

Question

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

theeric · Answer

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.

theeric · Answer

This might help, but I can't guarantee its accuracy http://img.tfd.com/dorland/refraction.jpg

anonymous · Answer

if as you say, the lens is significant, then im pretty sure that B is right!

theeric · Answer

http://www.eyesurgeon.ie/wp-content/uploads/2010/03/Refractive-Surgery-7.gif

theeric · Answer

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.

anonymous · Answer

yup b was right!

theeric · Answer

Cool, thanks! :)

theeric · Answer

http://www.hsc.csu.edu.au/biology/options/communication/2951/953-2.gif

theeric · Answer

"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

anonymous · Answer

thank you! :)

theeric · Answer

You're welcome!