An object is 30.0 cm to the left of a convex lens with a focal length of +8.0 cm. draw a ray diagram of the setup showing the location of the image. calculate the distance of the image from the lens. is the image upright or inverted?

Asmall 12.00g plastic ball is suspended by a string in a uniform, horizontal electric field with a magnitude of 10^3 n/c. if the ball is in equilibrium when the string makes a 30 ° angle with the vertical, what is the net charge on the ball?