Answer to Question #51840 in Optics for Samuel

Question

16 The potentiometer wire plays equivalent role of which of these devices in a circuit? a) rheostat b) thermostat c) galvanometer d) ammeter (17)The reason we can read print from any direction is that? a) the white part of a page reflects light in all directions b) letters emit black light in all directions. c) letters absorb black light from all directions. d) all of the above (18) In an experiment, potential difference is plotted on the vertical axis and current on the horizontal axis. The slope of the graph represents ? a) resistivity b)conductivity c) resistance d) conductance (19) For a metallic conductor, Ohm's law holds provided? a) potential difference varies b) current remains constant d) temperature remains constant d) potential difference remains constant 20 Calculate the distance and magnification of an object placed 20cm from a converging lens a) 60cm and 0.3 times the size of object b) 20cm and 0.3 times the size of object c) 60cm and 3 times the size of object d) 80cm and 3 times the size of