By Benjamin Crowell

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It’s up to you to decide what substance you want to use. You can bring something from home if you like. If you’re adventurous, one interesting possibility is to measure the speed of light of a solution, like salt in water, and you change the concentration. Another challenge would be to measure the speed of light in a vacuum — we have a vacuum pump and some vacuum flasks. Make sure to use the largest possible angles with respect to the normal. When the angles are small, you get a low-precision result.

Pointer is directly above the other. Chapter 3 Images able to locate the image’s position to within about a millimeter, and I got good agreement between the parallax method, opening one eye at a time, and depth perception, with both eyes open. B Changing the location Make a ray diagram, showing how each ray moves through the water, is refracted, and goes off through the air. 1 to predict whether the image should be ++ or +−. If you have time, do the other method too, and verify that you get the same answer.

Pointer is directly above the other. Chapter 3 Images able to locate the image’s position to within about a millimeter, and I got good agreement between the parallax method, opening one eye at a time, and depth perception, with both eyes open. B Changing the location Make a ray diagram, showing how each ray moves through the water, is refracted, and goes off through the air. 1 to predict whether the image should be ++ or +−. If you have time, do the other method too, and verify that you get the same answer.

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