Physics of Our Vison

What happens as light enters the eye?

• Light is absorbed by the cornea

• Light is focused by the lens onto the retina

• Light is reflected back out of the eye

• Light is converted into sound waves

And what do glasses do to correct vision?

• They magnify objects.

• They focus light on the retina.

• They change the color of objects.

• They block harmful UV rays.

In general, when we put two lenses in a system, what does the second lens "see"?

• The object itself

• The image formed by the first lens

• Nothing, it acts independently

• The light source

Fill in the blank: The clear, dome-shaped surface at the front of the eye that helps focus light as it enters the eye is called the _______.

• cornea

• retina

• lens

• pupil

Fill in the blank: The black circular opening in the center of the iris that controls the amount of light entering the eye is called the _______.

• pupil

• cornea

• retina

• lens

Fill in the blank: The colored part of the eye, which controls the size of the pupil by contracting or dilating in response to light, is called the _______.

• iris

• retina

• cornea

• lens

Fill in the blank: Located behind the pupil, the _______ focuses light onto the retina and changes shape to help focus on objects at various distances.

• lens

• cornea

• iris

• retina

Fill in the blank: The clear, gel-like substance that fills the space between the lens and the retina is called the _______.

• vitreous humor

• aqueous humor

• cornea

• sclera

Fill in the blank: The white outer layer of the eye that provides structure and protection is called the _______.

• sclera

• cornea

• retina

• iris

The function of the retina in the eye is to:

• Detect light and convert it into neural signals

• Focus light onto the lens

• Control the amount of light entering the eye

• Provide nutrients to the eye