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