9/18/2023 0 Comments Smartphone projectorThe distance between the middle of the lens and the principal focus is called the focal distance, F. The principal focus of the lens is the point in front of the lens where the converged rays meet. This results in the formation of a focused image. The lens converges rays of light travelling parallel to its principal axis. This type of lens is widest at the centre and thinnest at the edges. When our light rays meet, a clear and focused image is formed on the wall. In fact, much like a traffic conductor or a guiding GPS system, the lens has ensured that all of our rays, no matter where they came from on the screen of the phone, all meet at the principal focus. The bending effect of the lens has changed our direction of motion. Upon leaving the lens, the rays gain speed – we have rejoined the faster road. This slowing down causes our rays to change direction. We can think of the medium as the road on which we’re driving our vehicle – transitioning from one material to another causes a slowing in the rays just like turning into a road with a lower speed limit means we would need to decrease the speed of our vehicle. The medium our rays are travelling through changes from air to the material of the lens, which causes them to slow down. This axis is just a line passing through the centre of the lens and perpendicular to the vertical centreline of the lens (drawing a diagram would really help the explanation). These particular rays move parallel to the principal axis of the lens. The rays we’re travelling on leave the phone screen and travel towards the lens. Let’s each hop onto one of those rays leaving the screen and journey with it through the lens. These rays of light travel into our eyes and that is how we can see the images on the screen. The illuminated phone screen throws out rays of light. To change the image quality, try moving the box closer to the wall or further away. Turn the smartphone so that the image is upside down and rest it against the stand. Move the smartphone closer to and further away from the lens and mark the position which gave the best image.Īlign the smartphone stand to the marking and tape it to the bottom of the box. Play a video on the smartphone and hold it inside the box, facing the projector’s lens. Place the box in front of a plain white wall and turn down the lights. If the lens has a flat surface on one side, the outwardly- curved surface should be facing outwards. Hold the lens/magnifying glass inside the box, aligning it with the circular opening. Make a triangular stand for the phone using a spare piece of cardboard by making two lengthwise folds and forming a triangular shape. Only an adult should use the craft knife. Cut the circle slightly smaller than the outline. Draw its outline using the pencil.Ĭut out the hole for the lens or magnifying glass using the craft knife. Hold the lens or magnifying glass against one of the shorter sides of the box. The bending of light as it travels between media with different refractive indices.Ī property of an optical medium, which determines how fast light rays can pass through the medium. The point at rays passing through the lens converge.Īn image formed by the convergence of light rays. The distance between the centre of the lens and the focal point.Ī line running through the centre of the lens and perpendicular to the vertical centreline of the lens. In lenses, this refers to the intersection (meeting) of light rays.Ī lens which is thickest at the middle part and thinnest at the edges. Introduction to the the basic operation of a projector. Understanding how a convex lens can produce a magnified image on a screen. Experiment with lenses to learn how they focus light and affect image quality. Meta Description Build your own smartphone projector using recycled materials.
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