Ms. Sysmanski STUDY GUIDE The Optics of Lenses

Concave lenses are not able to produce real images and are used with convex lenses to create a ________ focal length

Longer

An eye problem caused by an unevenly curved cornea is ____________________

Antigmatism

People are nearsighted when they can see things far away _______________ but have fuzzy vision close to range

Clearly

A _____________ lens is used to correct the vision of a nearsighted person

Concave

Another type of lens is thicker at the edge than the middle and is called a ______________ lens

Concave

Parallel rays of light are refracted toward each other and brought to a focal point in a _______________ lens

Convex

To correct this problem, a ___________ lens is used

Convex

The light we see enters our eyes though the transparent covering of the eye called the _____________

Cornea

Lenses are made of transparent material and have a ____________ surface

Curved

When the object is more than twice the focal length from the lens, the real image is smaller than the object and __________________

Inverted

If the object is between one and two focal lengths, the image is ______________ than the object and inverted

Larger

Light is refracted both when it enters and leaves a ____________

Lens

To do this, the muscles relax, allowing the lens to be ______________ convex

Less

Images are properly focused on the retina by the convex lens on the eye, which is controlled by eye ________________ to focus images of distant objects, a longer focal _____________ is needed

Muscles, length

In a convex lens, the type of image formed depends on the position of the ____________ and the focal length of the lens

Object

All lenses work by _________________ light

Refracting

The light then passes through the pupil and converges on the back part of the eye called the ___________

Retina

The amount of refraction depends in the change of the speed of light as it passes through a material and on the __________________ of the lens

Shape

A convex lens has thin edges and a ________________ middle

Thick

When the object is between the lens and the focal point, the image is larger and upright but is a _________________ image

Virtual