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**Lens -- find the focal length**

**1. An object 3.0 cm tall is placed 20 cm in front of a converging lens. A real image is formed 10 cm from the lens. What is the focal length of the lens?**

**2. 1/f = 1/d**

_{o}+ 1/d_{i}**3. 1/f = 1/d**

1/f = 1/20 + 1/10

f = 6.667 cm

I'm not sure if this is right and if you can can you show me how the diagram would look like. Thank You!!

_{o}+ 1/d_{i}1/f = 1/20 + 1/10

f = 6.667 cm

I'm not sure if this is right and if you can can you show me how the diagram would look like. Thank You!!