4. An object located 20 cm away from a converging lens produces a focused image 15 cm away from the lens on the other side of the lens. (4)
(a) What is the magnification of this lens system?
(b) What kind of image is produced (real or virtual)?
(c)
Is the image upright or inverted?

Atank has a shape of a cone with a radius at the top of 2 m and a height of 5 m. the tank also has a 1 m spout at the top of the tank. the tank is filled with water up to a height of 2 m. find the work needed to pump all the water out the top of the spout. (use 9.8 m/s2 for g and the fact that the density of water is 1000 kg/m3.)