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 10^{o} and 170^{o}

Why not 0^{o} and 180^{o}_________________________________________________________

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 = ________________________________