reflection & mirrors. recap: diffuse reflection: gives a blurry image (or none at all) specular...
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Reflection & Mirrors
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Recap:Diffuse reflection: gives a blurry image (or none at all)
Specular reflection: gives a clear image
Mirror types:PLANE CONVEX CONCAVE
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Plane Mirrors• The image formed by plane
mirrors can only be seen behind the mirror.
• This is known as a virtual image.
• Image is the same size as the object.
• Only the right and left of the image is changed.
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Curved Mirrors• Curved mirrors can be either– concave (making a little cave) – Causes light to converge
– convex (vexing out in the middle) – Causes light to diverge
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Law of Reflection
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Ray Diagrams
• Show path of light from object mirror away from mirror
• Allows you to determine the location and properties of an image formed by a mirror or lens
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Ray Diagram: Basic set-up
** r = 2f
mirror
Principal axisC
(center of curvature)
F(focal point)
f(focal length)
r(radius of curvature)
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Ray Diagrams: images
• REAL vs. VIRTUAL• UPRIGHT vs. INVERTED• SAME SIZE, SMALLER, ENLARGED
COMPARE IMAGE TO ORIGINAL OBJECT
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Real or Virtual
Real images can project on a screen
Virtual images can only be seen in a mirror
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Upright or Inverted
Upright images are oriented the same as the object
Inverted images are oriented in the opposite direction as the object
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Reduced or Enlarged
Reduced images are smaller in size than the object
Enlarged images are larger in size than the object
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Get ready to draw diagrams…
• Take 2 different colored pencils• Take a slice of index card/Ruler– This will be your straight-edge– PUT YOUR NAME ON IT & KEEP IT– Decorate it if you want to
• Take a notes packet
• Ready? Let’s do this!
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Concave Mirror A
F
Step 1: draw horizontal ray from top of object to mirrorStep 2: draw reflected ray from point where ray hits mirror through focal pointStep 3: draw second ray from top of object through focal point to mirrorStep 4: draw reflected ray from point where ray hits mirror horizontally backStep 5: draw image from principal axis to intersection of reflected rays
Image is:REALINVERTEDLARGERFARTHER
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Concave Mirror B
F
Step 1: draw horizontal ray from top of object to mirror Step 2: draw reflected ray through focal point Step 3: draw second ray from focal point, through top of object, to mirror Step 4: draw horizontal reflected ray Step 5: continue both reflected rays behind mirror as DASHED LINES Step 6: draw image from principal axis to intersection of reflected rays
Image is:VIRTUALUPRIGHTLARGERFARTHER
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Convex Mirror
F
Step 1: draw horizontal ray from top of object to mirror Step 2: draw reflected ray from focal point through point where ray hit mirror and out Step 3: draw angled ray, aimed at focal point, to mirror Step 4: draw horizontal reflected rayStep 5: continue both reflected rays behind mirror as DASHED LINES Step 6: draw image from principal axis to intersection of reflected rays
Image is:VIRTUALUPRIGHTSMALLERCLOSER
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• Questions?
• Begin optics packet!