Answer:
pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water. Water that has more free hydrogen ions is acidic, whereas water that has more free hydroxyl ions is basic. Since pH can be affected by chemicals in the water, pH is an important indicator of water that is changing chemically.
Method 1:1. Start with your equation and determine which variables you know.
2. Use the lens equation to get d.
3. Sovle for h.
4. Solve for M.
5. Interpret your M value.
6. For diverging lenses, use a negative focal length value.
