MIMTY 4/4/11 How would your life change if there were no lenses or mirrors? MIMTY Notes on Reflection and Refraction OpticsOptics is the study of light. Polarized filters will block light twisted at certain angles When light passes through a diffraction grating, it can scatter like a wave Lenses and mirrors bend and reflect light to focus it notes Notes on Reflection and Refraction Law of Reflection Flat mirrors bounce light. You know this from experience. But how does it bounce? Notes on Reflection and Refraction Law of Reflection Flat mirrors bounce light. You know this from experience. But how does it bounce? Look at the setup below. Which way should we point the flashlight so that it bounces off the mirror and lights up the ball? mirror Notes on Reflection and Refraction Law of Reflection Well do this in steps (draw this) Mirror Notes on Reflection and Refraction Law of Reflection Well do this in steps (draw this) B A Mirror 1) Label our start and end. Notes on Reflection and Refraction Law of Reflection Well do this in steps (draw this) B A Mirror 1) Label our start and end. 2) Imagine B is really on the other side of the mirror. This B is called B prime. Notes on Reflection and Refraction Law of Reflection Well do this in steps (draw this) B A Mirror 1) Label our start and end. 2) Imagine B is really on the other side of the mirror. This B is called B prime. 3) Draw a light ray from A to B. Notes on Reflection and Refraction Law of Reflection Well do this in steps (draw this) B A Mirror 1) Label our start and end. 2) Imagine B is really on the other side of the mirror. This B is called B prime. 3) Draw a light ray from A to B. 4) The light will bounce off the mirror and go exactly to B. Notes on Reflection and Refraction Law of Reflection Important things: 1)The incoming ray is called the incident 2)The outgoing is called the reflected. 3)The angle of incidence and the angle of reflection are always equal. Notes on Reflection and Refraction Images from Mirrors It is important to note that the image we see in the mirror is virtual. This means that the light isnt coming from where we see it. It just looks like it. Notes on Reflection and Refraction RefractionRefraction is the bending of light by a lens or other object. When light changes what its going through, it almost always bends. We wont do the math for calculating the angle of bending, but know that it exists! Notes on Reflection and Refraction Images from Lenses Lenses can bend light. We usually draw setups for these in the same way. Notes on Reflection and Refraction Images from Lenses Lenses can bend light. We usually draw setups for these in the same way. f 1)The focal point is where parallel rays hitting the lens would converge. Notes on Reflection and Refraction Images from Lenses Lenses can bend light. We usually draw setups for these in the same way. focal length ff 1)The focal point is where parallel rays hitting the lens would converge. 2)The focal length is the distance from the lens to the focal point. Notes on Reflection and Refraction Ray Diagrams We draw ray diagrams to find out what kind of image a lens will make. All diagrams use the same steps. Notes on Reflection and Refraction Ray Diagrams We draw ray diagrams to find out what kind of image a lens will make. All diagrams use the same steps. 1)Draw the first ray horizontally, then bending through the focal point. Notes on Reflection and Refraction Ray Diagrams We draw ray diagrams to find out what kind of image a lens will make. All diagrams use the same steps. 1)Draw the first ray horizontally, then bending through the focal point. 2)Draw the second ray through the center of the lens. Notes on Reflection and Refraction Ray Diagrams We draw ray diagrams to find out what kind of image a lens will make. All diagrams use the same steps. 1)Draw the first ray horizontally, then bending through the focal point. 2)Draw the second ray through the center of the lens. 3)Draw the third ray through the near focal point, then horizontally. Notes on Reflection and Refraction Ray Diagrams We draw ray diagrams to find out what kind of image a lens will make. All diagrams use the same steps. image object 1)Draw the first ray horizontally, then bending through the focal point. 2)Draw the second ray through the center of the lens. 3)Draw the third ray through the near focal point, then horizontally. 4)The image forms where they converge. Vocabulary Optics Reflection Incident Object Real Image The study of light and its properties. When light bounces off an object. A light beam before it gets diverted. A symbol used to tell a virtual object from a real one The source or start of the light rays An image where light rays come to a point. Can be projected on a screen. vocab Vocabulary Virtual Image Refraction Lens Focal Point Focal Length An image where light rays do not come to a point. Cant be projected on a screen. The bending of light as it passes from one medium to another. A piece of glass for bending light. The point where parallel rays through a lens converge. The distance from the lens to the focal point. vocab Exit Question #27 Which of the things below can both reflect AND refract light? a) A mirror b) A lens c) A pane of glass d) A smooth piece of metal e) Jell-o f) None of the above