T Object R. Optical axis $ Image h d- T do Figure 2 We can geometrically derive the mirror equation as follows. Consider the image shown in fig. 2. (a) What do we know about 0 and 0', and why? Use this to show that holdo-hi/di. (Be careful about signs here!) (b) What do we know about and $'? Use this to show that == do-R ho h R-d (c) Use the results of the previous two parts to derive the mirror equation, 1+= do