Optics :: essays research papers

Aim To examine characteristics of a converging lens and the images they create. Also to examine the focal length and how the cerebrate fountainhead may be found and developing rules for locating an image via electron beam drawings and the intersection of glows. Chromatic aberration will also be explored and wherefore it happens.Theory Both lenses and mirrors have a principle axis, yet a lens has two focal points as opposed to a mirror that has and adept. 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) organism on the same side as the light source. Focus points on thin double convex lenses are located at each 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 commentary of each image produced will also be given (attitude, type, ma gnification and location).Apparatus The main tools (apparatus) used in the experiment consist of a ray quoin 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 taken.Method1. 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 axis, a mark where the ray leaves the box was do as well as where it hits the lens (on both sides) and wh ere the ray bisects the principle axis. After this, the ray box was removed and using a ruler, rays were accurately drawn. The focus point (f) was measured to be of length 7.3cm (7.25). 2. The lens was replaced backward on a sheet of paper with ray box emitting three rays, the middle ray lined up on the principle axis, marks were made where the rays intersected at on the principle axis and this was measured to be the primary focus point.