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37 Cards in this Set
- Front
- Back
lens are ..... |
A piece of transparent material that can bend, or refract light rays. |
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concave lenses |
Thinner in the middle than at the edge. They are used to diverge light rays. (ex. eyeglasses, telescopes) |
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How does the image that the concave lens forms looks like? |
The image is upright and smaller than the object. |
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convex lenses |
Thicker in the middle than at the edge. They are used to converge light rays. (ex. magnifying glass) |
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What happens to the light ray when it passes from air into glass? |
It bends toward the normal. |
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What happens to the light ray when it passes from water into air? |
It bends away from the normal. |
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What happens to the light ray when it passes from air into water? |
It bends toward the normal. |
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What happens to the light ray when it passes from a transparent plastic into air? |
It bends away from the normal. |
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What happens to the image if the object is more than two focal length in front of the lens? |
The image is smaller than the object and inverted. |
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What happens to the image if the object is one to two focal length away from the lens? |
The image is larger than the object and inverted. |
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What happens to the image if the object is less than one focal length away from the lens? |
The image is located on the other side of the lens and is upright and larger than the object. |
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focal length |
The distance from the center of the lens to the focal point. |
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List two factors that affect the way that light is refracted through a lens. |
1. The shape of the lens. (convex/concave) 2. The distance between the object and the lens. |
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What will happen if the object is directly at the focal point? |
There will be no images. |
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absorbed |
Become "trapped". |
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the angle of incidence (i) |
The angle formed by the incident beam and the normal. |
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the angle of reflection (r) |
The angle formed by the reflected beam and the normal. |
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the angle of refraction (R) |
The angle of a ray of light emerging from the boundary between two materials, such as from air into glass, measured between the refracted ray and the normal. |
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incident ray |
The incoming ray. |
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law of reflection |
The angle of reflection equals the angle of incidence. |
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mirage |
The refraction of light through air. |
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normal |
An imaginary line that is perpendicular to the boundary between two materials (such as air and glass) and intersects the point at which the incident ray reaches the boundary. |
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opaque |
All or most of the light is absorbed or reflected so thatnone of the light passes through. (ex. a book, a metal can, and a wall.) |
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particle model of light |
A lantern flame was thought to release tiny particles of light, which travelled in a perfectly straight line until they entered an eye, where they were absorbed to make an image. |
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ray |
An imaginary line showing the direction in which light is traveling. |
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ray diagram |
Shows how the distance from the light source affects the size of the shadow that an object makes. |
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ray model of light |
Light is simply represented as a straight line, or ray, that shows the direction the light wave is travelling in this model. |
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reflected |
Bounce off. |
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reflected ray |
The ray that bounces off the barrier. |
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translucent |
Only some of the light is transmitted, and that light isscattered in all directions. (ex. waxed paper, clouds, and lampshades.) |
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transmitted |
Pass straight through. |
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transparent |
All or most of the light is transmitted. (ex. clear glass, air, and water.) |
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What happens when light reflects from a plane mirror? |
When light reflects from a plane (flat) mirror, the rays of light bounce off the mirror in a regular pattern. |
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What is the relationship between the size of the shadow and the distance of the object from the light source? |
The object casts a larger shadow when it is closer to the light source. The object casts the smaller shadow when it is farther from the light source. |
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What three things can happen to light when it strikes a material? |
Transmitted, reflected or absorbed. |
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What will happen if light rays slow down as they refract? |
They will bend toward the normal. |
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What will happen if light rays speed up as they refract? |
They will bend away from the normal. |