SNC2D The Human EyeMs. Kueh

Textbook (Science Perspectives 10), Section 13.6 (pp. 572–577)

Draw and label each part of the eye (in the space provided below).

Provide a ray diagram for a human eye that is focused on the object. Label each of the following: ho, hi, do, di, f as well as the location of the retina.

As the object moves closer to lens, describe the physiological changes the eye undergoes to focus on the object.

Hyperopia

__________ - sightedness

No problems seeing __________ , difficulty seeing ___________ images

The light focuses _______________ the retina

To correct hyperopia, would a converging or diverging lens be required?

Positive Meniscus – a modified form of the _________________ lens shape. More

cosmetically appealing than a basic __________ lens, but it is also ______________________

_________________________________.

Presbyopia

A form of __________ - sightedness

eye lens loses its elasticity when people get ______________

people have a harder time reading small print

can be corrected by glasses

Myopia

__________ - sightedness

No problems seeing __________ , difficulty seeing ___________ images

The light focuses _______________ the retina

To correct myopia, would a converging or diverging lens be required?

nswer the following questions:

Using the Lens Equation, demonstrate why it is necessary the lens in the eye change its size to focus on an object.

Negative Meniscus – a modified form of the _________________ lens shape. More

cosmetically appealing than a basic __________ lens, but it is also ______________________

_________________________________.

Contact Lenses – a lens that is placed directly on the cornea of the eye and serve the same

purpose as _________________.

Homework: pg. 577 # 1-6