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Science 10:Characteristics of a PLANE MIRROR.pptx
- 1. Characteristics of a PLANE MIRROR
- 2. Reflection of Light: Mirror
- 4. Directions: Fill in the blanks in the sentence below. Below each paragraph are words corresponding on the properties and behavior of light that you will encounter in this module. Light is a natural agent that stimulates sight and make things possible. It is a type of energy known as 1. ___________. It is given out by luminous objects such as the sun, light bulbs and laser. It is made up of little packets of energy called 2.___________. Light travels as waves. But unlike sound waves, it does not need any material to carry its energy along. This means that light can travel through a 3. ____________ - a completely airless space. Light waves travel out from their source in a straight lines called 4. __________.
- 5. Light behaves in a variety of ways when it comes in contact with water, air, and other matters. When light strikes matter, a part of light is 6. “__________” into the matter and is transformed into heat energy. If the matter that the light strikes is a transparent material, the light component that was not absorbed within the material is 7. “__________” through and exits to the outer side of the material. If the surface of the material is smooth (a mirror for example), 8.“_________” occurs, but if the surface is irregular having pits and protrusions, the light 9. “__________”.
- 17. Image Characteristics of a PLANE MIRROR Virtual vs. Real Images In the case of plane mirrors, the image is said to be a virtual. Virtual images are images that are formed in locations where light does not actually reach. Light does not actually pass through the location on the other side of the mirror; it only appears to an observer as though the light is coming from this location. Whenever a mirror (whether a plane mirror or otherwise) creates an image that is virtual, it will be located behind the mirror where light does not really come from. Object Distance is equal to the Image Distance Size of Image is equal to the size of the Object Orientation is always upright
- 19. Left-Right Image Reversal Why is the reversal observed in the left to right direction and not in the head to toe direction? If you look up at a person's shirt from the front, the letters do not appear reversed. But if you could view the lettering on the shirt from "behind the shirt", then the letters would appear reversed. The change in the frame of reference causes the appearance of reversed lettering.
- 21. The Anatomy of a Curved Mirror “converging “ mirror “diverging “ mirror
- 22. The Anatomy of a Curved Mirror
- 23. The Anatomy of a Curved Mirror
- 24. The simpler method relies on two rules of reflection for concave mirrors. They are: 1. Any incident ray traveling parallel to the principal axis on the way to the mirror will pass through the focal point upon reflection. 2. Any incident ray passing through the focal point on the way to the mirror will travel parallel to the principal axis upon reflection. 1 2
- 25. Step-by-Step Method for Drawing Ray Diagrams IMAGE CHARACTERSTICS: Location = Between C & F Orientation = Inverted Size = Reduced Type = Real
- 26. IMAGE CHARACTERSTICS: Location = At C Orientation = Inverted Size = the same size as the object Type = Real
- 27. IMAGE CHARACTERSTICS: Location = beyond the center of curvature Orientation = Inverted Size = Enlarged Type = Real
- 28. IMAGE CHARACTERSTICS: Location = Behind the mirror Orientation = Upright Size = Enlarged Type = Real
- 29. No Image is formed
- 33. IMAGE CHARACTERSTICS: Location = Behind the mirror Orientation = Upright Size = Reduced Type = Virtual
Editor's Notes
- Light is form of energy that you can see! Every day, light waves reflect on objects and into your eyes, which allows you to see the objects. Light also helps you identify objects both near and far.
- waves that are created as a result of vibrations between e field and magnetic field. In othr words, Both the electric field and the magnetic field oscillate perpendicular to each other and to the direction of the propagating wave. Speed of light in vacuum is the highest velocity a material body can attain, so it is the highes velocity information can be transmitted. Light exhibits certain behaviors that are characteristic of any wave
- Do activity “Light as Rays”
- Why Does a Rough Surface Diffuse A Beam of Light? For each type of reflection, each individual ray follows the law of reflection. However, the roughness of the material means that each individual ray meets a surface which has a different orientation. The normal line at the point of incidence is different for different rays. Subsequently, when the individual rays reflect off the rough surface according to the law of reflection, they scatter in different directions. The result is that the rays of light are incident upon the surface in a concentrated bundle and are diffused upon reflection. The diagram below depicts this principle. Five incident rays (labeled A, B, C, D, and E) approach a surface. The normal line (approximated) at each point of incidence is shown in black and labeled with an N. In each case, the law of reflection is followed, resulting in five reflected rays (labeled A,, B,, C,, D,, and E,). Ex. clothing, paper, and the asphalt roadway leads to a type of reflection known as diffuse reflection. Whether the surface is microscopically rough or smooth has a tremendous impact upon the subsequent reflection of a beam of light. paper consists of numerous fibers that makes the surface of paper microscopically rough. Light that strikes the surface is diffised about the surface, illuminating the entire surface.
- Do activity “ Multiple Reflection”
- In the animation above, a right-side-up object is located above the principal axis between the focal point (F) and the mirror. The ray diagram shows that the image of this object is located as a right-side up image positioned behind the mirror. In fact, it can be generalized that anytime the object is located between the focal point (F) and the mirror, the image will be located behind the mirror. In such cases, the image will be upright (not inverted) and larger in size than the object. Such images are called virtual images because they are not formed by the actual convergence of reflected light rays at the image location. Virtual images are always formed on the opposite side of the mirror as the object.
- a convex mirror was described as a portion of a sphere that had been sliced away. If the outside of the sphere is silvered such that it can reflect light, then the mirror is said to be convex. The center of that original sphere is known as the center of curvature (C) and the line that passes from the mirror's surface through the sphere's center is known as the principal axis. The mirror has a focal point (F) that is located along the principal axis, midway between the mirror's surface and the center of curvature. Note that the center of curvature and the focal point are located on the side of the mirror opposite the object - behind the mirror. Since the focal point is located behind the convex mirror, such a mirror is said to have a negative focal length value.
- The image in the diagram above is a virtual image. Light does not actually pass through the image location. It only appears to observers as though all the reflected light from each part of the object is diverging from this virtual image location. The fact that all the reflected light from the object appears to diverge from this location in space means that any observer would view a replica or reproduction when sighting along a line at this location.