8. A dentist has a choice of three small mirrors, a convex, a concave and a plane one to
examine the back of your teeth. State which one he should use to give the best view. Give
reasons for your choice.

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.)