# Phys 1.5 - Lenses

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• Created by: Dan
• Created on: 02-05-13 20:46
How do lenses work?
Parallel rays of light pass through a lense and meet at a single point
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What is the name of this point where light meets?
Principle focus or focal point
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How is the focal length determined?
The distance of the focal point to the centre of the lense
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There are 2 focal points, why?
Light can pass through a lense on both sides, there's one focal point each side of the lense
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If an object is further away from the lense than the focal point, what sort of image is formed?
An inverted, real, magnified image is formed
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How is magnification calculated?
magnification = Image height / Object height
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What does the size of the image depend on?
How close the object is to the lense
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if the image is nearer to the lense than the focal point, what sort of image is formed?
An upright, virtual, magnefied image is formed
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What does diverge mean?
The rays of light seperate
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What does converge mean?
The rays of light meet at a single point
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How does a diverging lense have a focal point if the light seperates?
The direction the light diverges can be used to find a focal point the other side of the lense
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Images produced by diverging lenses are always?
Virtual
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Axis arrows on a graph of a diverging lense point what way? Inward or outward?
Arrows point inwards
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Axis arrows on a graph of converging lense point what way? inward or outward?
Arrows point outward
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## Other cards in this set

### Card 2

#### Front

What is the name of this point where light meets?

#### Back

Principle focus or focal point

### Card 3

#### Front

How is the focal length determined?

### Card 4

#### Front

There are 2 focal points, why?

### Card 5

#### Front

If an object is further away from the lense than the focal point, what sort of image is formed?

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