A double convex lens has faces of radii 18 cm and 20cm. when an object is 24cm the lens,
a real image is formed 32cm from the lens. Determine
1. the focal length of the lens
2. the refractive index of the lens material​

Which is gerrymandering a problem for the house of representatives but not the senate? a.) members of the house are greatly influenced by their political parties. b.) senators serve longer terms than members of the house. c.) members of the house are more influenced by changes in public opinion. d.) senators are elected in statewide elections rather than in specific districts.