Question

7.2?7.3?7.4?

Image Saeen Convex Light Source and Objact Figure 7.1- A sketch of the apparatus run the PhET simulation "Geometric 7.1] Action-Item: Download and Optics". You should see a sketch of an object, a thin, convex lens, and an image, with two light rays passing from one particular point on the object through the lens, to one particular point on the image, and beyond. The horizontal line stretching across the screen is called the "principle axis". The small "x" marks are the focal points of the lens. Familiarize yourself with the controls. Once you are ready, switch from Marginal rays" to "Principle rays Move the object forward, backward, and side-to-side. The principle rays and image should also move. [7.2] Question: Use the simulation to answer the following questions: a. What happens to the image as you increase the distance between the b. Describe what happens as you move the object inside the focal point on c. Move the object until the object is slightly larger than the image, and object and the lens? the object side of the lens along the principle axis. you can see all three principle rays. Increase the curvature radius. What happens to the lens? What happens to the image? Restore the curvature radius to a value around 0.8 m. Increase the 're- fractive index'. What happens to the principle rays? What happens to the image? d. [7.3] Question: Using this simulation, describe each principle ray. Your goal is to describe each ray in words in a way that allows someone else, who has not seen the diagram but who has read your verbal description, to sketch each principle ray correctly from your description. Include your description and a sketch that allows your TA to identify each ray visually in your answer (for example, you could number the rays and provide a description by number). You may find the "2nd point" from the simulation to be a useful reference. (7.4] Question: Continue working with the simulation until you are confident that you understand the properties that affect a lens's ability to image an object. What affects the size of the image? What affects the brightness? What affects the position of the image? List the properties you discovered in your answer.

Answer 1

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