A 10 cm tall rose is placed in front of a converging lens. An image of height 40 cm is noticed on the other side of the lens.
a) Calculate the magnification. Provide only the answer (no steps needed).
b) is the image smaller or larger than the original object? How do you know?
c) Is the image inverted or upright? Real or virtual? How do you know?​

Two steel balls, each of mass m, are welded to a light rod of length l and negligible mass and are initially at rest on a smooth horizontal surface. a horizontal force of magnitude f is suddenly applied to the rod as shown. determine (a) the instantaneous acceleration a of the mass center g and (b) the corresponding rate at which the angular velocity of the assembly about g is changing with time.