image formation by reflection, refraction,and paraxial approximation

Name: Grade and Section: Score: School: Teacher: Subiect: General Physics 2 LAS Writer: JEREMIAH S. SABRIDO Content Evaluator: EMMA T. SURITA MICHAEL DAVE NALAGON Lesson Topic: lma e Formation b Reflection Refraction and Paraxial roximation Quarter 4 Wk. 3 LAS 3 Learning Targetls: Explain Image formation as an application of reflection, refraction, and paraxlal approximation. STEM-GP120PTlVd22 Referencets): Serway and Faugn, J., 2006. Hoff Physics. 10801 N. MoPac Expressway, Building 3, Austin, Texas 73759: Holt, Rinehart and Winston, pp.446-494. image Formation by Reflection, Refraction, and Paraxlal Approximation Light reflected from smooth, shiny Surfaces such as a mirror or water in a pond, is reflected in one direction only. The symmetry of reflected light is described by the law of reflection, which states that the angles of the incoming and reflected rays are equal. The simplest mirror is the plane mirror. A plane mirror always forms a virtual image, which always appears as if it is behind the surface of the mirror. For this reason, a virtual image can never be displayed on a physical surface. Also, the image is the same size as the object. When rays of light propagate from one medium to another, these rays undergo refraction, which is when light waves are bent at the interface between two media. The retracting surface can form an image in a similar fashion to a reflecting surface, except that the law of refraction (Snell's Law) is at the heart of the process instead of the law of reflection. When looking at a fish underwater, a cat sitting on a pier perceives the fish to be closer to the water's surface than it actually is, as shown in Figure 2(a). Conversely, the fish perceives the cat on the pier to be farther from the water's surface than it actually is, as shown in Figure 2(b). The reason is that light is bent toward the normal when it travels from a medium with a lower index of refraction (the air) to one with a higher index of refraction (the water). Extending this ray along a a W, ' If", m 9,, straight line shows the cat's image to be above the cat's actual position. Figure 2[a] Figure 2m In geometric optics, the paraxial approximation is a small angel approximation used in ray tracing of light through an optical system such as lenses. A statement of the approximation involves the optical axis, which is a line that passes through the center of each lens and is oriented in a direction normal to the surface of the lens (at the center).The formation of images in a converging and diverging lens are shown on the ray diagrams below. Ray Diagrams . lma es created b a Diver in Lens Images created bv Converorno Lenses a V a q Conguration: obiect OUtSide 2F: real, The image creat-d by a diverging lens is smaller Image between F and 2F always a virtual, smaller image gure 3(b) Figure 4 Configuration : object at innity; point image at F Figure 3(a) ACTIVITY: Answer the following questions on a separate sheet. 1. If one wall of a room consists of a large flat mirror, how much larger will the room appear to be? Explain your answer. 2. Explain why an object in water always appears to be at a depth shallower than it actually is. . Given the diagram, identify where the object is placed and describe the image being formed