A thin lens with a focal length of 6.00 cm is used as a simple magnifier. (a) What angular magnification is obtainable with the lens if the object is at the focal point?

Video transcript

Hi everyone in this practice problem, we're being asked to calculate the angular magnification of a magnifier. For this practice problem, we are inspecting a jule with a magnifier and the magnifier is built using a thin lens with a focal length of four centimeter. If the jule is placed at the focal length of the lens, we're being asked to determine the angular magnification of that magnifier assuming that our nearest point is 28 centimeter. The options given are a seven B, 14 C 32 and D 100 and 12. So the angular magnification for a simple magnifier is given by the equation of M equals to D near divided by F. In this case, F is the focal length and D near is the nearest point M is the angular magnification. And given in the problem statement, our near point or dear is 28 centimeter and our focal length or F is four centimeter. So therefore, we can substitute these two values into our M formula or our angular magnification formula to get that value. So dear is 28 centimeter and then F or focal length is four centimeter. And calculating this, we will get our angular magnification to be equals to seven. So seven will be the answer to this practice problem which will correspond to option A in our answer choices. So the angular magnification is going to equal to seven and that will be it for this video with option A being the answer that will be it for this video. If you guys still have any sort of confusion, please make sure to check out our other lesson videos on similar topics on our website. But other than that, thank you.