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43 Cards in this Set
- Front
- Back
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What is the particle model of light?
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A model that represents light as a stream of fast-moving, tiny particles that travel in a straight line to the eye, where they are absorbed to form an image
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What is transparent?
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Allowing light to pass through but not enough to see objects clearly
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What is translucent?
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Allowing some light rays to pass through but not enough to see objects clearly
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What is opaque?
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Absorbing or reflecting all light and not allowing any light to pass through
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How big will the shadow be compared to your distance to the light source?
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Closer to the light source, the bigger the shadow is
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Why can you not see your reflection in the paper?
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This is because if you looked really really closely to the paper it is not smooth but it is rough so it reflects light randomly
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What is the law of reflection?
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A predictable behavior of reflected light, stated as: the angle of reflection equals the angle of incidence
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What is the incident ray?
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The ray that strikes a reflecting or refracting material
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What is the reflected ray?
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Light that is bounced back from a reflecting surface
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What is the normal?
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An imaginary line drawn perpendicular to a reflecting surface at the point where an incident ray strikes the surface
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What is the angle of incidence?
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The angle formed by the incident ray and the normal
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What is the angle of reflection?
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The angle formed by the reflected ray and the normal
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What is the angle of refraction?
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The angle of a ray of light emerging from the boundary between two materials, measured between the refracted ray and the normal
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What happens when a ray passes from a less dense material to a denser material?
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The ray bends towards the normal
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What happens when a ray passes from a denser material to a less dense material?
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The ray bends away from the normal
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What is a mirage?
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A misleading appearance or illusion; can be the result of refraction of light through air layers of different densities
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What is a plane mirror?
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A flat, smooth mirror that reflects light
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Are left and right reversed by a plane mirror?
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Yes, because the rays diverge
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What is a concave mirror?
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A reflective surface that curves inward and can magnify objects
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What is the focal point?
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The point at which converging light rays meet or from which light rays diverge
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What is converging?
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Coming together at a point
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What are uses for the concave mirror?
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Spotlights, makeup mirrors, flashlights, lighthouses and car lights
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In a concave mirror what happens when the object is far away from the focal point?
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The image formed will be small and upside down
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In a concave mirror what happens when the object is close to the focal point?
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It will appear larger but still upside down
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In a concave mirror what happens when the object is in front of the focal point?
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It will appear larger and upright
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What happens to the rays when is strikes a concave mirror?
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The light rays enter parallel and then bounce back and converge through the focal point
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What is a convex mirror?
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A reflective surface that curves outward
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What happens to the light rays when it strikes a convex mirror?
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The light rays enter parallel and diverge
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What are the two characteristics of the reflection of a convex mirror?
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Objects often appear smaller than they are and more objects can be seen compared to a plane mirror of the same size
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What are some uses for convex mirrors?
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Security purposes, rear view and side view mirrors in automobiles
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What are concave lenses?
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A lens that is thinner and flatter in the middle than around the edges; it refracts light rays so they spread out
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What happens when light enters a concave lens?
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The rays will diverge
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What are concave lenses used for?
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Eyeglasses, and some telescopes
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What will the image formed by the concave lens look like?
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Smaller and upright
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What are convex lenses?
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A lens that is thicker in the middle than around the edges; focuses light rays at a focal point
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What happens to light rays when they enter a convex lens?
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The parallel light rays will converge
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What happens in a convex lens if the object is faraway from the focal point?
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It will appear smaller and inverted
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What happens in a convex lens if the object is one to two focal lengths away?
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It will appear larger and inverted
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What happens in a convex lens if the object is at the focal point?
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No image
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What happens in a convex lens if the object is in front of the focal point?
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It will appear larger and upright
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What is a lens?
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A curved piece of transparent material that refracts light in such a way as to converge or diverge parallel light rays
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What is diverging?
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Spreading apart
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How can sunlight be used to burn paper?
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If you use a convex lens you direct all the light into one particular spot and all the concentrated light burns the paper
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