reflection of light in curved mirror.ppt
- 1. Reflection of Light in a Curved Mirror
- 2. 4 Pics 1 Word CONCAV E
- 3. THINK and PICK 1. When the image of an object is seen in a concave mirror the image will _____. A. always be real B. always be virtual C. be either real or virtual D. will always be magnified
- 4. 2. When the object is at infinity in the case of a concave mirror, the image formed has the following properties. A. The image is real. B. The image is inverted. C. The image is highly diminished to a point. D. All of the above
- 5. 3. Rays of light traveling parallel to the principal axis of a concave mirror will come together _____. A. at the center of curvature B. at the focal point C. at infinity D. at a point half way to the focal point
- 6. 4. It is a curved mirror in which the reflective surface bulges away from the light source. A. concave mirror B. convex mirror C. plane mirror D. all of these
- 7. 5. The object in the image formed by this mirror looks bigger than the original size of the object. A. concave mirror B. convex mirror C. plane mirror D. all of these
- 8. Perform Activity: What is the Magic Behind This? 1. What did you see on the mirror?
- 9. Perform Activity: What is the Magic Behind This? 2. What did you notice about the size of the image on the mirror?
- 10. Perform Activity: What is the Magic Behind This? 3. Get a plane mirror and look at the image of your hand on it. How will you compare the reflection/ image on a plane mirror and the image formed in given picture above
- 11. Perform Activity: What is the Magic Behind This? 4. What kitchen utensils at home will give you a bigger image or reflection. Find them?
- 12. ACTIVITY: All About Me Study the concave mirror diagram that shows the focus (F), focal length, center of curvature (2F),and principal axis.
- 13. Quick guide in ray diagramming! 4:20 – 6:20
- 14. Spherical Mirrors – Concave & Convex Also called CONVERGING mirror Also called DIVERGING mirror
- 15. Converging (Concave) Mirror A converging mirror is one that is spherical in nature by which it can FOCUS parallel light rays to a point directly in front of its surface. Every spherical mirror can do this and this special point is at a “fixed” position for every mirror. We call this point the FOCAL POINT. To find this point you MUST use light from “infinity” Light from an “infinite” distance, most likely the sun.
- 16. Converging (Concave) Mirror f C C f 2 2 Since the mirror is spherical it technically has a CENTER OF CURVATURE, C. The focal point happens to be HALF this distance. We also draw a line through the center of the mirror and call it the PRINCIPAL AXIS.
- 17. DEFINITION OF PARTS: Center of Curvature- the point in the center of the sphere from which the mirror was sliced. Focal Point/Focus- the point between the vertex and the center of curvature. Vertex- the point on the mirror's surface where the principal axis meets the mirror.
- 18. Principal Axis- line passing through the center of the sphere and attaching to the mirror in the exact center of the mirror. Radius of Curvature- the distance from the vertex to the center of curvature. Focal Length- the distance from the mirror to the focal point.
- 19. Characteristics of Image Formed by Concave Mirror Concave mirrors can produce both real and virtual images. They can be upright (if virtual) or inverted (if real). They can be behind the mirror (if virtual) or in front of the mirror (if real). They can also be enlarged, reduced, or the same size as object.
- 20. Ray Diagram A ray diagram is a pictorial representation of how the light travels to form an image and can tell you the characteristics of the image. Principal axis f C object Rule One: Draw a ray, starting from the top of the object, parallel to the principal axis and then through “f” after reflection.
- 21. Ray Diagrams Principal axis f C object Rule Two: Draw a ray, starting from the top of the object, through the focal point, then parallel to the principal axis after reflection.
- 22. Ray Diagrams Principal axis f C object Rule Three: Draw a ray, starting from the top of the object, through C, then back upon itself. What do you notice about the three lines that are being reflected? THEY INTERSECT The intersection is the location of the image.
- 23. Ray Diagram – Image Characteristics Principal axis f C object After getting the intersection, draw an arrow down from the principal axis to the point of intersection. Then ask yourself these questions: 1) Is the image on the SAME or OPPOSITE side of the mirror as the object? Same, therefore it is a REAL IMAGE. 2) Is the image ENLARGED or REDUCED? 3) Is the image INVERTED or RIGHT SIDE UP?
- 24. The Mirror/Lens Equation Is there any OTHER way to predict image characteristics besides the ray diagram? YES! One way is to use the MIRROR/LENS equation to CALCULATE the position of the image. i o d d f 1 1 1
- 26. Activity A: Looking at Me A. B. 1. Which picture is a concave mirror? ._________________________________ 2. Why do you say so? ______________________________________________
- 27. Study the image in each situation and supply the missing letters to complete the words that will identify the properties of a curved mirror. Don’t forget to practice “CAMALIG” in doing such activity. Activity B: Words Completion
- 29. Activity C: Fill Me Up! IMAGE Location of the Object Location Orientation (upright or inverted) Size (same, reduced, or enlarged) Type ( real or virtual) CONCAVE MIRROR 1. Farther than the Center of Curvature 2. At the Center of Curvature 3. Between the Center of Curvature and the Focal point 4. At the Focal point 5. Between the Focal point and the Center of the lens (vertex)
- 30. IMAGE Location of the Object Location Orientation (upright or inverted) Size (same, reduced, or enlarged) Type ( real or virtual) CONCAVE MIRROR 1. Farther than the Center of Curvature Between C and F Inverted reduced Real 2. At the Center of Curvature At C Inverted Same Real 3. Between the Center of Curvature and the Focal point Beyond C Inverted Enlarged Real 4. At the Focal point No Image is formed 5. Between the Focal point and the Center of the lens (vertex) Behind the mirror Upright enlarged virtual
- 31. THANK YOU!!!