Thin Lenses

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Medicine

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10 Terms

1
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What is a convergent lens?
Convex
2
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What is a positive lens?
Convex
3
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What is a divergent lens?
Concave
4
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What is a negative lens?
Concave
5
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Describe convex lenses
Thinnest at the edge, thickest in the centre
6
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Describe concave lenses
Thickest at the edge, thinnest in the centre
7
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How is a convex lens represented on a ray diagram?
Double headed arrow
8
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How is a concave lens represented on a ray diagram?
Inverted double arrow
9
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What are the 3 rays for thin lenses?

1. Rays parallel to the axis are deviated to pass through f2
2. Rays passing through f1 emerge from the lens parallel to the axis
3. Rays through the pole of the lens are not deviated
10
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What is P?
Pole of the lens