Graciela measures the height of an image of a model bridge that she constructed to be 84.2 cm. If the actual bridge is 23.3 cm tall, what is the magnification that lens that is producing the image of the bridge?

An electron moves with a constant horizontal velocity of 3.0 × 106 m/s and no initial vertical velocity as it enters a deflector inside a tv tube. the electron strikes the screen after traveling 26 cm horizontally and 19 cm vertically upward with no horizontal acceleration. what is the constant vertical acceleration provided by the deflector? (the effects of gravity can be ignored.)