Term
| Does a lens refract or reflect? |
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Definition
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Term
| A lens refracts ____________ ________ of light so that they cross-or appear to cross- at a focal point. |
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Definition
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Term
| A converging lens is ____________ in the middle. |
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Definition
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Term
| A diverging lens is ___________ in the middle. |
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Definition
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Term
| A _____________ lens forms a magnified virtual image when the object is within one focal length of the lens. |
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Definition
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Term
| Name 2 optical instruments that use lenses. |
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Definition
| Camera, telescope, compound microscope, projector |
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Term
| A diverging lens always forms reduced _____________ ___________. |
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Definition
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Term
| True or False. The human eye reflects light. |
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Definition
| False. The eye lens refracts light. |
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Term
| The human eye focuses light on the _______________________. |
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Definition
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Term
| A piece of glass that can bend parallel rays of light so that they cross, or appear to cross, at a single point is called a __________________. |
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Definition
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Term
| The line joining the centers of curvature of the surface of the lens is called the ________ _________. |
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Definition
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Term
| For a converging lens, the point at which a beam of light parallel to the principal axis converges is the _________ _______. |
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Definition
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Term
| For a ___________lens, the point from which a beam appears to come is called the focal point. |
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Definition
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Term
| For a diverging lens, name the plane that passes through the point where a beam appears to come from. (Must be perpendicular to the principal axis) |
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Definition
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Term
| For a converging lens, a ________ passing through either focal point of a lens that is perpendicular to the principal axis is called the focal plane. |
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Definition
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Term
| For a converging or diverging lens, the distance between the center of the lens and its focal point is called the _____________ ______________ |
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Definition
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Term
| An image formed through ____________ or ________________ that can be seen by an observer but cannot be projected on a screen because light from the object does not come to a focus is called a _________ __________. |
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Definition
reflection
refraction
virtual image |
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Term
| An image that is formed by converging light rays that can be displayed on a screen is called a _____ _______. |
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Definition
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Term
| A diagram showing rays that can be drawn to determine the size and location of an image formed by a mirror or lens is called a ______ __________. |
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Definition
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Term
| When a real image is formed, the object and image are on ___________ sides of the lens. |
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Definition
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Term
| Name the lens of a telescope closest to the eye that enlarges the real image formed by the first lens. |
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Definition
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Term
| In an optical device using compound lenses, the lens closest to the object observed is called the _________ _______. |
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Definition
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Term
| The amount of light that enters the eye is regulated by the _____. |
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Definition
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Term
| The opening in the eyeball through which light passes is called the _______. |
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Definition
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Term
| The transparent covering over the eyeball is called the _______. |
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Definition
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Term
| The layer of ____________-___________ tissue at the back of the eye is called the retina. |
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Definition
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Term
| If a person’s eye forms images _________ the retina, the person is called far-sighted. |
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Definition
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Term
| A _____ - _______ person needs to wear converging lenses. |
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Definition
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Term
| A person who can see nearby objects clearly but distant objects focus in front of the retina is called ____ sighted. |
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Definition
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Term
| Name the eye defect that occurs when the cornea is curved more in one direction than the other. |
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Definition
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Term
| The distortions in a lens’ image are called _____________________. |
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Definition
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