Name:_______________________________ 4-digit Code Number:_______________________________

- Describe a quick way to tell a converging lens from a diverging lens with no equipment.
- Derive the formula for error in the focal length:
(f) /
f
^{2}= ( d_{o}) / d_{o}^{2}+ ( d_{i}) / d_{i}^{2}from the lens grinder's equation. - Describe in detail the two methods for determining the focal length of a diverging lens which are used in this lab.
- What is a third method for determining the focal length of a diverging lens which is not used in this lab?

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