Move the beam of light around and watch the angle and spot width change.

Record the width of the spot for every 10 degrees between 10o and 170o
Why not 0o and 180o_________________________________________________________

Is there a pattern?____________
Describe it_________________________________________________________

Use the TI-83 calculator and the steps from part two to enter your data, graph it and see if there is a mathematical function that will ‘fit’ the data. Make a sketch of your graph below and write the equation you found that best fits the data.

Y = ________________________________