Cell biology Lab Report Example | Topics and Well Written Essays - 2500 words

Cell biology - Lab Report Example The oculars are also identified as the eyepiece lens and are the ones that a person looks into so as to see magnified specimen and are usually of 10X or 15 X magnifications. The objectives are the lens closest to the object and are usually of different magnification powers. The objective lens is held together by a revolving nose piece that is able to rotate in an easy manner enabling the change of the different lens powers. These powers are of three or four different types and are mostly four, ten, forty, and a hundred times. For complete magnification, both the eyepiece and the objective lens powers are multiplied. The eyepiece and the objectives are connected by a type of tube that is usually straight in shape. This tube is connected and supported to the base by a part identified. For the microscope to function, it is important to have an illuminator that is described as a steady light source that is usually about one hundred and ten volts. In most cases, the illuminator is usually used in place of a mirror that is used to reflect light from an external light source. The specimen are placed on slides and then placed on a platform commonly known as the stage and is usually at the bottom part of the microscope. It is important to understand that the specimen require to be held in place as the magnification takes place. The most common of all microscopes have movable stages that can move right, left, top or bottom. A condenser lens is used to direct light rays from an illumination source to the specimen that is bound to get examined. Condenser lenses are most useful at the highest powers (400X and above).   Microscopes with in stage condenser lenses render a sharper image than those with no lens (at 400X).   If your microscope has a maximum power of 400X, you will get the maximum benefit by using a condenser lenses rated at 0.65 NA or greater.   0.65 NA condenser lenses may be mounted in the stage and work quite well.   A big advantage