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Investigating The Compound Microscope Essay

1735 words - 7 pages

Aim:To investigate and understand the effects of two convex lenses – the objective and the eyepiece lenses – being placed apart forming a magnified image.Theoretical Background:Light microscopes are used by scientists everywhere around the world. From looking at a fibre from a string to looking at cells in living organisms, which is physically impossible for us to look at with our eyes. It is an item that can magnify objects up to 1000 times larger. The first light microscope was invented by a scientist called Robert Hooke (1635 – 1703), who found out that by placing 2 convex lenses apart from each other in a specific distant, it is possible to magnify any object. The light microscope is basically made up of 5 components, the eyepiece lens (also known as the ocular lens) the objective lens, stage, focus and the light source. (Please see diagram below)Picture of a Light MicroscopeSource: http://static.howstuffworks.com/gif/light-microscope-diagram-3.gifAlthough some microscopes might have extra features, such as the coarse focus, condenser adjustment, illuminator, diaphragm, etc, but the basics are the 5 components stated before. The effects of the 5 components are as follows:1.Objective lens – Used to enlarge object and to invert objects into a real image.2.Eyepiece lens – Simple magnifier. Used to view the image formed by the objective lens.3.Stage – used to place object such as an extract of cell from a plant, fibre of a string, etc.4.Light source – used to send light (image) from the object to the objective lens5.Focus – moves the objective and eyepiece lens away or close to the object in order for finer view of the image.The formula, which Robert Hooke used as a reference to find out the ratio of ‘distance of 2 lens’ to ‘focal length’ to ‘objective lens to object’, was:1/f = 1/v + 1/uWhere f is the focal length, v is the distance between the lens and image, and u is the distance between the lens and the object.Although light microscopes are used everywhere around the world, its ability to magnify fine details is very limited as the refractive materials used to manufacture the lenses are not perfect enough to refract the light totally, perfectly and accurately. Also, light microscopes are only capable of imaging 2 dimensional images only, whereas, some other types or microscopes can take images into 3 dimensional shapes. However, this is not a big problem, as the only information needed in order for a successful experiment at this point of time, is lenses which are capable to magnify images up to 20, and the formula which will be used throughout does not take in consideration whether the image is 2 dimensional or 3 dimensional. Therefore, as a first step into the wide world of optical physics, by studying the effects of light microscopes is extremely essential.Hypothesis:The shorter the focal length, the magnification should be large and the further apart the two lenses are,...

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