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Plab16_11G

Plab16_11G - Lab 16 An Optical Asylum SAR Physics A M...

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Unformatted text preview: Lab 16: An Optical Asylum SAR Physics A M Kolchin Introduction In this lab we’ll observe various optical phenomena and record our obervations in words and drawings. The exhibits in this lab illustrate the following optical effects: 1. Diffraction (Table I) 2. Reflection and Refraction (Table II) 3. Thin convex lenses (Table III) 4. Color Addition (Table III) Instructions: Go to each table and work through the sta- tions at that table. Finish all of the exhibits at the table before moving on to the next table. The lab handout has directions and related questions for each station. Follow the directions and answer the questions using complete sen- tences. You will hand in the lab at the end of the class. In some cases you may need a neighbor to shut off a light for a minute so as to observe an effect more clearly. Please extend this type of courtesy to each other. 1 THE EXHIBITS Table I: Diffraction When waves pass through slits, they spread, they bend, and they interfere with each other. All waves do this, and even small particles like electrons will do this when they pass through slits. A slit can be a clear line on a black background or the space between atoms in a crystal. At this table, we will use a plastic slide that has clear lines on a black background. There are 1000 such slits per millimeter of width on this slide. This slide is called a diffraction grating . Station 1: Observing the Diffraction Grating Look through the two microscopes focused on the slides. One of them magnifies the slide by 400 times, the other magnifies it by 1000 times. QUESTIONS: 1. Do you see the lines through the microscopes? 2. If the slits are spaced at 1000 per millimeter, how do they appear to be spaced when look- ing through the microscope that magnifies them 1000 times?...
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Plab16_11G - Lab 16 An Optical Asylum SAR Physics A M...

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