review from last class – complete in your notes. 1.a pinhole camera creates an image of a 37-...
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Review from last class – Complete Review from last class – Complete in your notes.in your notes.Review from last class – Complete Review from last class – Complete in your notes.in your notes.
1.A pinhole camera creates an image of a 37-meter-tall tree. If the image is 2.4 cm tall and inverted, what is the magnification of the camera?
2.Mirrors divert light using ______________, lenses divert light using ______________.
3.Describe the difference between specular and diffuse reflection.
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Assignment 3/23 and3/24Assignment 3/23 and3/24
Turn in optical devices worksheet
Homework:
Read 20.3 and 20.4
Page 596, 1-13,
29, 30, 31, 52, 55,
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Ray Diagrams Ray Diagrams (3/25 and 3/26)(3/25 and 3/26)
Mirrors
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ReflectionReflectionReflection from a mirror:
Incident ray
Normal
Reflected ray
Angle of incidence
Angle of reflection
Mirror
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The Law of ReflectionThe Law of Reflection
Angle of incidence = Angle of Angle of incidence = Angle of reflectionreflection
In other words, light gets reflected from a surface at THE SAME ANGLE it hits it.
The same !
!!
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Flat MirrorsFlat Mirrors
Angle of incidence
Angle of reflection=
Normal
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Flat MirrorsFlat Mirrors
If the rays leave the optical system and appear to come from some point in space, the point they appear to come from is a virtual image.
The converging reflected rays indicate the location of the image
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Image DescriptionsImage Descriptions
How can we describe this image?
1.Is it upright or inverted?2.Is it magnified or unmagnified?3.Is it virtual or real?
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Image DescriptionImage Description
This is an UPRIGHT, UNMAGNIFIED AND VIRTUAL image
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Ray DiagramsRay Diagramsfor spherical mirrorsfor spherical mirrors
Rules for drawing a ray diagram:1. Draw an incident ray parallel to the principal axis, then
a reflected ray through the focal point2. Draw an incident ray through the focal point, then
parallel to the principal axis3. Draw a final line through the center point and back
along itself
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Spherical Mirrors - Spherical Mirrors - ConcaveConcave
Image is REAL, INVERTED, and DEMAGNIFIED !!!
C F
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Spherical Mirrors – ConcaveSpherical Mirrors – ConcaveObject Inside the Focal Object Inside the Focal
PointPoint
Image is VIRTUAL, UPRIGHT, and MAGNIFIED
C F
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Spherical Mirrors - Spherical Mirrors - ConvexConvex
Image is VIRTUAL, UPRIGHT, and DEMAGNIFIED
C F
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EquationsEquations
1/f = 1/do + 1/di
1/ focal length = 1/object distance + 1/image distance
m = - di/do
Magnification = - image distance / object distance
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HomeworkHomeworkHomeworkHomework