ANALYSIS
1. Straight Line Propagation of Light:
In steps 1 and 2 of the Procedure, explain
your observations in terms of the straight-line
propagation of light. Include a diagram showing how the width of the slit
images depends on the orientation of the Light Bulb filament with respect
to the Slit Plate.
2. Law of Reflection: In step 7 of the Procedure, determine the relationship between the angle of incidence and the angle of reflection, and answer Question 7.
3. Law of Refraction: Using the data obtained in step 14 of the Procedure, construct a graph with sin θr on the x-axis, and sin θi on the y-axis for each incident angle. The Data Table has 2 additional columns for you to enter these data and select them. Use the Excel Chart Maker to make this plot.
Select the x-y scatter icon
from the top Toolbar.
Click on the chart itself.
Click on the legend and hit Delete.
From the View menu, select the Formatting Palette if it is not already present.
Select Chart Title from the Title pull-down menu and fill it in.
Next select titles for the Horizontal and Vertical axes and fill them in.
Use the mouse to size the chart and to locate it below the data on the worksheet.
4. Click on any one of the data points.
Choose Chart...Add Trendline from the menu.
Under the Options tab, choose Display equation on chart. The equation of the best straight line fit to the data will appear on the chart. Move it to the top header of the plot to make it readable.
5. Record the slope of the best straight line through the data, and enter the value in cell D87. The result is the index of refraction for the acrylic plastic that the lens is made of.
6. Look up the value of the index for plastic in a handbook and
record the value in cell D89. Compute the percentage error between
your measurement and the accepted value, and enter it in cell D91.