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# Mirror - Physics by: Rey San Andrew Rimando

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In this PowerPoint Presentation, you will find related topics with explanation like the Three Types of Mirror; it's characteristics and functions. Attached also is the video presentation used under the hyperlink(UNDERLINED WORDS). I'm hoping this will help a lot of students. Thanks! -Rey

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### Mirror - Physics by: Rey San Andrew Rimando

1. 1. SEPTEMBER 24,2012PHYSICS LABORATORYENGINEERING PHYSICSII
2. 2. A mirror is an object with at least one polished and therefore reflectivesurface. The most familiar type of mirror is the plane mirror, which has a flat surface.Curved mirrors are also used, to produce magnified or diminished images or focus light or simply distort the reflected image.
3. 3. Three Types of Mirrors 1. Plain Mirror - is a mirror with a planar reflective surface Note: A flat mirror reflects light rays in the same order as they approach the mirror
4. 4. How Plain Mirror works?For the Plain Mirror, the light reflected according to the Law of Reflection When a light ray is incident upon a reflecting surface, the angle of reflection is equal to the angle of incidence. Both of these angles are measured relative to a normal drawn to the surface. The incident ray, the reflected ray, and the normal all lie in the same plane.P.S. Reflection – bouncing back from a surface
5. 5. Two Kinds of Reflection  Diffuse reflection When rays are reflected from a rough surface, they are reflected in many directions and no clear image is formed. None of the normal drawn to the surface (at the point at which the incident light ray strikes the surface) are parallel.  Regular reflection When rays are reflected from a smooth surface, they are reflected so that a clear image is formed. The reflected rays are nearly parallel. The normal drawn to the surface (at the point at which the incident ray strikes the surface) are nearly parallel.
6. 6. When the eyes receive these light waves, it looks as ifthe waves are diverging from behind the mirror, making itappear as if the object is behind the mirror as well. This type ofimage is called a VIRTUAL IMAGE, because light waves do notactually pass through that point, it only appears so. Thedistance between the object and the mirror is called the objectdistance and the distance between the virtual image and themirror is the image distance. Notice that on plane mirrors, theobject distance is equal to the image distance.Here’s how the REAL OBJECT and the VIRTUAL IMAGEworks..The Formation of the Real Object & Virtual Image
7. 7. Characteristics of a Plain Mirror  Object size = image size  Object distance = image distance  Orientation = erect  Always forms a virtual image  Image is reversed, left to right
8. 8. Dotted lines Shows the Apparent Ray sourceAngle of incidence = Angle of Reflection For each ray
9. 9. Three Types of Mirror2. CONCAVE MIRROR Concave mirrors reflect light inward to one focal point, therefore they are used to focus light. Unlike convex mirrors, concave mirrors show different types of image depending on the distance between the object and the mirror itself. These mirrors are called "converging" because they tend to collect light that falls on them, refocusing parallel incoming rays toward a focus. This is because the light is reflected at different angles, since the normal to the surface differs with each spot on the mirror.
10. 10. Characteristics of ConcaveMirror  The focal length is positive (because the object and the focus are on the same side of the mirror)  The object and the focus are on the same side of the mirror (inside the arc)  Real images can be formed by the mirror when the object is outside of the focus; an inverted image is formed  Virtual images are formed by the mirror when the object is within the focus; an erect image is formed  No image is formed when the object is at the focus  When the object is at the center of curvature, an inverted image is formed at the center of curvature
11. 11. Real FocusParallel rays Focal length = + Forms real, inverted, Reduced or enlarged Reflected rays Image. Also forms Virtual, erect, Enlarged images.
12. 12. Object beyond 2f Parallel ray 2f f Image is: Real Inverted Reduced Appears between f & 2f
13. 13. Object at 2f Parallel ray 2f fImage is:RealInvertedSame sizeAppears at 2f
14. 14. Three Types of Mirror 3. Convex Mirror -is a curved mirror in which the reflective surface bulges toward the light source. Convex mirrors reflect light outwards, therefore they are not used to focus light. The image is always virtual (rays havent actually passed though the image), diminished (smaller), and upright . These features make convex mirrors very useful: everything appears smaller in the mirror, so they cover a wider field of view than a normal plane mirror does as the image is "compressed".
15. 15. Characteristics of ConvexMirror  The focal length is negative (because the object and the focus are on opposite sides of the mirror)  The object and the focus are on opposite sides of the mirror (the focus is on the inside of the mirror and the object is on the outside)  Only virtual images are formed; all images are smaller than the object
16. 16. Virtual focus Dotted lines Shows the Apparent Ray focusParallel rays Focal length = -Reflected rays Forms only virtual, erect, reduced images between the virtual focus and the mirror.
17. 17. ApparentParallel ray Convergence of rays (f) 2f Image is: Virtual Erect Reduced Appears behind the mirror
18. 18. …the END!...
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