**. We will use Excel (or whatever spreadsheet
you may have at home) to aid in this effort.**

**1. In four convenient colums list the
values for Di, Do, Hi & Ho.**

**2. Lateral magnifiation (M) = Hi/Ho =
Di/Do. For each pair of values, calculate M from the height ratio
and from the object/image distance ratio. Show these ratios in
adjacent columns. How do they compare?**

**3. You have several pairs of values for
Di & Do. For each case calculate f, the focal length. Calculate
means build a formula in the spreadheet to do the drudgery
for you. How consistent are the answers for each pair of values?
how would you explain any irregularities? How do these values
of the focal length compare with the image distance for the house
across the parking lot?**

**4. What kind of graph would you expect
if you plotted Di vs. Do? Take a guess and then graph these data
using graph wizard.**

**Last edited 01/01/06**