Physics - Lenses

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• Created by: becky.65
• Created on: 18-04-16 19:37
What happens when parallel rays of light pass through a convex lense?
They are refracted so that they converge to a point
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What is the point that light rays always converge to?
The principle focus
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In convex lens, what happens if the object is beyond 2F?
An inverted, real, smaller than the object image is formed
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In a convex lens, what happens if the object is at 2F?
An inverted, real, same size as the object image is formed
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In a convex lens, what happens if the object is between F and 2F?
An inverted, real, larger than the object image is formed
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In convex lens, what happens if the object is less than F?
An upright, virtual image is formed behind the image and the image is magnified
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How can magnification be calculated?
magnification = image height/object height
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What happens when parallel rays of light pass through a concave lens?
They are refracted so that they diverge from a point
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What image is always produced by a concave lens?
It is always virtual, upright, smaller than the object and on the same side as the object
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What causes short sight?
The uncorrected image is formed in front of the retina because the eyeball is too long or the eye lens is too powerfu
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How can short sight be corrected?
Using a diverging lens
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What causes long sight?
The uncorrected image is formed behind the retina because the eyeball is too short of the eye lens is too weak
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How can long sight be corrected?
Using a converging lens
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Other cards in this set

Card 2

Front

What is the point that light rays always converge to?

Back

The principle focus

Card 3

Front

In convex lens, what happens if the object is beyond 2F?

Card 4

Front

In a convex lens, what happens if the object is at 2F?

Card 5

Front

In a convex lens, what happens if the object is between F and 2F?