mirror and lens review - lhsblogs.typepad.com · •reflection –bounce off ... images formed by...
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Mirror and Lens Review
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Diverging and Converging
Diverging Converging
• Convex lens
• Concave mirror
• Concave lens
• Convex mirror
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Uses of Mirrors and Lens
• Concave mirror – makeup mirror, mirror dentist uses to magnify your teeth
• Convex mirror – rear-view mirror, mirror shopkeeper uses in corners to produce a wider image of his store
• Concave lens – used on the back of buses to see more out of the back; corrects nearsightedness
• Convex lens – magnifying lens; used to correct farsightedness
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Definitions to Know
• Converging – come together
• Diverging – spread apart
• Reflection – bounce off
• Refraction – bending due to a change in speed
• Focal Point – the point where light rays meet
• Real Image – formed when light rays come together; can be viewed on a screen
• Virtual Image – formed behind mirrors; when light rays diverge
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Specular vs. Diffuse Reflection
Specular
• Light rays reflect parallel
• Will form an image
Diffuse
• Light rays reflect in many directions
• No image is formed
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Law of Reflection
• States the angle of incidence is EQUAL to the angle of reflection
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Images formed by Mirrors
Concave Mirrors
• Real images – far away from mirror (outside f)
• No image – at f
• Virtual images – close to the mirror (between f and the mirror)
Convex Mirrors
• Always forms virtual images
![Page 8: Mirror and Lens Review - lhsblogs.typepad.com · •Reflection –bounce off ... Images formed by Lenses Convex Lenses •Real images –far away from lens (outside f) •No image](https://reader030.vdocuments.us/reader030/viewer/2022040621/5f346517a69a667e7c66ae0a/html5/thumbnails/8.jpg)
Images formed by Lenses
Convex Lenses
• Real images – far away from lens (outside f)
• No image – at f
• Virtual images – close to the lens (between f and the lens)
Concave Lenses
• Always forms virtual images
![Page 9: Mirror and Lens Review - lhsblogs.typepad.com · •Reflection –bounce off ... Images formed by Lenses Convex Lenses •Real images –far away from lens (outside f) •No image](https://reader030.vdocuments.us/reader030/viewer/2022040621/5f346517a69a667e7c66ae0a/html5/thumbnails/9.jpg)
real, inverted, reduced
real, inverted, same
real, inverted, magnified
NO IMAGE
virtual, upright, magnified
virtual, upright, reduced
Mirror Diagram
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real, inverted, reduced
real, inverted, same size
real, inverted, magnified
NO IMAGE
virtual, upright, magnified
virtual, upright, reduced
Lens Diagrams
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More on Refraction• Refraction occurs because light changes speed when it enters a new medium
• Less dense to more dense – light will slow down and bend toward the normal
Example: air to water
• More dense to less dense – light will speed up and bend away from the normal
Example: glass to air
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Total Internal Reflection• Only can occur when light travels from a more dense to less dense medium
• Used in fiber optics technology
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Mirror/Lens Math
𝑑𝑖 = (𝑓−1 − 𝑑0−1)−1
Determine the image distance when an object is placed 30 cm from a concave mirror with a focal length of 10 cm.
𝑑𝑖 = (10−1 − 300−1)−1
𝑑𝑖 = 15 𝑐𝑚