Passage of light inside the eye Flashcards
How can the eye detect an object
What bounces off the object?
Where does this light go in the eye first?
What does the cornea do to the light? (what does refract mean? Why is light refracted by the cornea?) (change of direction is caused by a change in? When light travels into the water from the air what happens to its speed? what does this cause a change in?
Why is water denser than air? (molecules)
Light from an object goes to the cornea which refracts the light
Light is refracted (bent) by the cornea due to its curved surface, and because the outer cornea contains water, which makes it denser than the air outside the eye
Water is denser than air as the molecules of a liquid are more compact than those of air which is a gas.
Light refracts whenever it travels at an angle into a substance with a different refractive index (optical density). This change of direction is caused by a change in speed (when light travels from air into water, it slows down causing it to continue to travel at a different angle or direction)
The refraction of light occurs throughout the eye (it first occurs in the cornea), this ensures that the light of the image is directly focused on the retina.
Which parts of the eye are the most important in refracting light?
Why? (What does this allow the light to be focused on?)
What does refraction of light mean, and why is it important?
The cornea and lens refracts light rays so that they are only focused on the retina
Refraction of light = bending of light
Refraction ensures that the rays of light are only focused on the retina.
Refraction occurs due to different density levels
What is Accomadation?
Accommodation refers to the ability of the lens of the eye to adjust its focal length accordingly
Fcal length refers to the distance between the lens of the eye and the retina
