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Chapter 30 Vocab

A transparent material that can bend parallel rays of light so that they cross or appear to cross at one point. Lens
A lens thick in the middle causing parallel rays to converge. Converging Lens
Lens thick in the middle causing parallel rays to converge. Convex Lens
Lens thin in the middle causing parallel rays to diverge. Diverging Lens
Lens thin in the middle causing parallel rays to diverge. Concave Lens
Line joining the centers of curvature of the surfaces of a lens. Principal Axis
the point at which a beam of light parallel to the principal axis converges or appears to converge. Focal Point
Plane perpendicular to the principal axis that passs through either focal point of a lens. Focal Plane
Distance between the center of a lens and its focal point. Focal Length
Image formed by converging light that can be displayed on a screen. Real Image
Image that can be seen by an observer but can't be projected onto a screen because light from the object doesn't actaully come to a focus. Virtual Image
Diagram showing rays that can be drawn to determine the size and location of an image formed by a mirror or lens. Ray Diagram
Lens of a telescop closest to the eye; enlarges a real image formed by the first lens. Eyepiece
In an optical device using compound lenses, and is the lens closest to the object observed Objective Lens
Transparent covering over the eye Cornea
Colored part of the eye surrounding the pupil. It regulates the amount of light entering the eye. Iris
Opening in the eye through which light passes Pupil
layer of light sensitive tissue at the back of the eye Retina
A person who has trouble focusing on nearby objects because the images form behind the retina Farsighted
A perosn who has trouble focusing on far away objects because the images form in front of the retina. Nearsighted
Defect of the eye caused when the cornea is curved more in one direction than another. Astigmatism
Distortion in an image produced by a lens Aberration
Region in the center of our field of view where vision is sharpest. Fovea
Spot in the retina where nerves carrying all th information leave the eye in a narrow bundle. Blind Spot
The action of the ciliary muscles to change the shape of the lens so we can see near and far objects clearly. Accommodation
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