If you treat a 14 × eyepiece of a microscope as a magnifying glass that produces an image at infinity, what is its focal length? the microscope is designed for an image distance of 172 mm from the objective, and the objective is marked 25 ×. what is its focal length?

Two 1.20-m nonconducting wires meet at a right angle. one segment carries + 2.50 µc of charge distributed uniformly along its length, and the other carries - 2.50 µc distributed uniformly along it, as shown in fig. 21.50. ( a. find the magnitude and direction of the electric field these wires produce at point p, which is 60.0 cm from each wire. ( b. if an electron is released at p, what are the magnitude and direction of the net force that these wires exert on it?