Athin lens with a focal length of 6.0 cm is used as a simple magnifier by (a) what angular magnification is obtainable with the lens if the object is at the focal point? (b) when an object is examined through the lens, how close can it be brought to the lens? assume that the image viewed by the eye is at the near point, 25.0 cm from eye, and that the lens is very close to the eye.

An electron is ejected into a horizontal uniform e⃗ field at a parallel horizontal velocity of v0. assume the electron's initial position x0, initial velocity v0, time t, magnitude of electric field e, electron's mass m, and the magnitude of the electron's charge |e|. ignore the force that earth exerts on the electron. assume the e⃗ field is in the same direction as the initial velocity. part a define the equation for the electron's velocity. express your answer in terms of the variables v0, |e|, t, e, and m.