Tham khảo tài liệu 'sat ii physics (gary graff) episode 1 part 6', ngoại ngữ, ngữ pháp tiếng anh phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | CHAPTER 3 The law of reflection can be stated as follows The angle of incidence equals the angle of reflection. A spherical concave mirror reflects light toward a point on the central radius called the focal point. The radius of curvature is the distance from the mirror to its center if the mirror were a full sphere. This is called the principal axis. Concave spherical mirrors are important tools in science because of their ability to focus incident light. The point where incident rays are focused is called the focal point and is one half the radius of curvature. r f r 2 Peterson s SATIISuccess Physics WAVE PROPERTIES Two rules worth remembering about light rays that strike a concave mirror are 1. Any light ray that is moving parallel to the principal axis and is incident to the mirror will be reflected though the focal point. 2. Any light ray that passes through the focal point and is incident to the mirror will be reflected parallel to the principal axis. Light rays from objects O placed in front of a concave mirror produce images I . The images produced may be real projectable onto a screen or virtual appearing to be located on the other side of the mirror they may be enlarged magnified or shrunk reduced or they may be right side up erect or upside down inverted . The following diagrams illustrate the position of the image when the object is placed in various locations in front of the mirror. Object distance is considered infinite. Light rays are parallel as they approach and strike the mirror. Image is located at f. It is reduced inverted and real. Object is located outside r but not at infinity. Image is located between f and r It is reduced inverted and real. Peterson s CHAPTER 3 Object is located at r. Image is located at r It is the same size as the object inverted and real. Object is located between r and f Image is located beyond r. It is magnified inverted and real. Object is located inside f. Image is located behind the mirror. It is .
