1. A double convex lens has a focal length of 0.10 m. An object 0.05 m high is placed 0.15 m from the lens surface on the principal axis. Sketch a ray diagram and give the characteristics of the image.

2. A component in an automobile 12-V electrical system has a resistance of 20 .

a. How much current is in the component when the system is in operation?

b. How much energy is dissipated by the component each second?

3. Three resistors, 10 , 20 , and 30 , are wired in parallel and connected to a 12-V battery. How much current flows in the circuit?