Welcome to the Virtual Optics lab of the Physics Department of the University of Colorado! Please open https://phet.colorado.edu/sims/geometric-optics/geometric-optics_en.html You need to run this from a laptop, your tablet or phone won't work. Allow Adobe Flash if they ask you. Install it if necessary. Set to Principal rays. Make the lens diameter as big as possible (1.3 m). Click on "Show help" Questions? Ask a classmate. Together we are strong! 1. The object is on the left, the image is on the right. Drag the lens a little bit to the left. Q1: What happens to the size of the object while dragging the lens to the left? (nothing) Q2: What happens to the size of the image while dragging the lens to the left? (it gets ...) 2. Move the object to such a position that the size of the object is equal to the size of the image. Measure the distance of the object to the lens (call it v) and measure the focal length (call it f). Q3: How much is b/f in this case? 3. Manipulate the settings and distances such that the size of the image is much smaller than the size of the object. Q4: These settings would be useful when designing a (choose the best answer) camera? / beamer? 4. Manipulate the settings and distances such that the size of the image is much larger than the size of the object. Q5: These settings would be useful when designing a (choose the best answer) camera? / beamer? 5. So far so good! Now: Call distance of the object to the lens: v (voorwerp) Call distance of the image to the lens: b (beeld) Call focal length: f (brandpuntsafstand) The theoretical formula linking b,v and f is 1/v + 1/b = 1/f Q6: Verify this formula for assignment 4. To do this, measure v,b and f. Write down your calculations. Q7: Verify this formula for Q3. Write down your calculations. Thank you for visiting our online lab. Please take a minute to visit the website of our sponsor: https://www.colorado.edu/
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