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Aim To examine characteristics of a converging lens and the images they create Also to examine the focal length and how the focus point may be found and developing rules for locating an image via ray drawings and the intersection of rays Chromatic aberration will also be explored and why it happensTheory Both lenses and mirrors have a principle axis yet a lens has two focal points as opposed to a mirror that has only one When considering converging lenses the primary focal point PF can be found on the opposite side of the lens in regards to the light The secondary focal point SF being on the same side as the light source Focus points on thin double convex lenses are located at either side of the lens measured from the middle of the lens itself see below Chromatic aberration is a problem of converging lenses that will also be explored in this experiment A description of each image produced will also be given attitude type magnification and locationApparatus The main tools apparatus used in the experiment consist of a ray box containing cards which allow one two three or four rays onto a sheet of paper at a time so that rays path from the box to the mirror will be able to be traced Also two 2 different types of converging lenses one being cylindrical while the other being spherical the difference being that the spherical one is used for viewing the cylindrical one for use with the ray box These lenses are one of many different sorts of lenses in the lens box The use of a ruler would also be helpful so that accurate measurements may be takenMethod1 A cylindrical lens was placed on paper and traced around a principal axis was drawn making sure that its at rights angles to the lens The ray box was switched on exposing only one ray and lined up parallel to the principle
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