P3.2 - lenses

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  • Created by: Chip
  • Created on: 12-04-13 11:05
what is a converging lens?
A canverging lens is a convex lens. It makes parallel rays to converge (COME IN) a focus.
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What are converging lenses used for?
A magnifying glass and a camera lens to make distant objects clearer.
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What is a diverging lens?
It is a concave lens, that amkes parallel rays SPREAD out
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What is a diverging lens used for?
THey are used to correct short sightedness. (people's eyes who can see near but not far!)
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How is a virtual image formed?
A virtual image is formed by a diverging lens. Also if the object is closer to the lens than the principal focus
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How is a real image formed?
A real image is formed by a converging lens if the object is futher away than the principal focus
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What is the formula to work out magnification?
Image height divided by object height.
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If the image is larger than the object...?
the magnification is greater than 1
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if the image is smaller than the object...?
the magnification is less than 1
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the distance from the centre of the lens to the principal focus is the...?
focal length of the lens
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Other cards in this set

Card 2

Front

What are converging lenses used for?

Back

A magnifying glass and a camera lens to make distant objects clearer.

Card 3

Front

What is a diverging lens?

Back

Preview of the front of card 3

Card 4

Front

What is a diverging lens used for?

Back

Preview of the front of card 4

Card 5

Front

How is a virtual image formed?

Back

Preview of the front of card 5
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