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# Curved Mirrors

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• 1. Curved Mirrors
• 2. Reflection Characteristics
Attitude
Type
Inverted
Upright
Size
Real
Virtual
Laterally Inverted
Same
Enlarged
Reduced
• 3. Type
Real - image appears in front of the mirror (could be projected onto a screen)
Virtual - image appears behind the mirror
• 4. Size
a) Enlarged - image is larger than the object
b) Reduced - image is smaller than the object
c) Same - image is the same size as the object
a)
b)
c)
• 5. Attitude
a) Upright- image is right-side up
b) Inverted- image is upside-down
c) Laterally Inverted- image is flipped horizontally
a)
MIRROR
b)
MIRROR
MIRROR
c)
MIRROR
• 6. Curved Mirrors
Concave
Convex
“converging” mirror
“diverging” mirror
• 7. Concave Mirrors
• 8. Concave Mirrors
• 9. f
Terminology
Focal Point (F) - where the light rays meet
Vertex - the middle point of a curved mirror
Focal Length (f) - the distance from the focal point to the vertex
vertex
principal axis
• 10. Concave Mirror Ray Diagrams
Ray 1 - travels parallel to the principal axis and reflects through the focal point (F)
• 11. Concave Mirror Ray Diagrams
Ray 2 - travels through the focal point and reflects parallel to the principal axis
• 12. Concave Mirror Ray Diagrams
The point where the two reflected rays converge will be the location of the image
• 13. Concave Mirror Reflections
4 Cases
Object is greater than 2 focal lengths from the mirror (do>2f)
Object is between 1 and 2 focal lengths from the mirror (f<do<2f)
Object is at the focal point (do=f)
Object is between the mirror and the focal point (0<do<f)
• 14. Case 1:
Reduced
Inverted
Real
• 15. Case 2:
Enlarged
Inverted
Real
• 16. Case 3:
No Image Formed!
• 17. Case 4:
Enlarged
Upright
Virtual
• 18. Handout p.429
“Drawing Ray Diagrams for Concave and Convex Mirrors”
• 19. Convex Mirrors
• 20. Curved Mirrors
Concave
Convex
“converging” mirror
“diverging” mirror
• 21. Convex Mirrors
Surface of mirror is curved outward
Spreads out light rays (“diverging” mirror)
Produces a virtual image that is upright and smaller than the object
• 22. Convex Mirrors
• 23. Convex Mirrors
• 24. Ray Diagrams for Convex Mirrors
Ray 1: travels parallel to the principal axis and reflects through the focal point
• 25. Ray Diagrams for Convex Mirrors
Ray 2: travels towards the focal point and reflects parallel to the principal axis
• 26. Ray Diagrams for Convex Mirrors
The image appears where the (virtual) reflected rays appear to intersect
• 27. Remember:
The image for a convex mirror is always virtual, upright and smaller!
• 28. Try it!