# Forming images with lenses

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• Created by: apple87
• Created on: 06-04-15 18:07
What happens when a wave hits a boundary between one medium and anouther?
Some energy is reflected back into the first medium and the rest is transmitted through into the second medium.
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How does a high optical density affect a wave?
It will travle more slowly.
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What is the formula for refractive index?
Speed of light in a vacuum/speed of light in the material.
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How do lenses change the curvature of wave fronts?
By refraction
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What does the lense do to a wave front?
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What shape will the wave front be if an uncruved wave passes through a lense paralle to the lense axis?
There will a spherical curvature, centred on the focus point.
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How does the lense curve the wave fronts?
By slowing the light travelling through the center of the lense for longer than the light at the edge.
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What is the focal length?
The distance between the lense axis and the focal point
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What happens to the wave front as the lense gets thicker?
It will curve more strongly.
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What is the formula for working out the power of a lense?
Power(p)=1/Focal length(f)
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What is the formula used to define curvature of a wave?
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How do you calculate curvature after?
Curvature after= Curvature before + curvature added by lense
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What happens the wave front if the source is distant?
The wave front will be flat.
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What is the formula for calculating linear magnification?
m=size of the image/size of the object
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## Other cards in this set

### Card 2

#### Front

How does a high optical density affect a wave?

#### Back

It will travle more slowly.

### Card 3

#### Front

What is the formula for refractive index?

### Card 4

#### Front

How do lenses change the curvature of wave fronts?

### Card 5

#### Front

What does the lense do to a wave front?