Microscope On Forensics

Microscopes and magnifying glasses work by using lenses and light. A lens is usually a thin, circular glass, thicker in the middle, which bends rays of light so that when you look through it an object appears enlarged. A microscope uses several lenses. It also has a set of adjustments to give you a choice over a much you want to magnify. When we want to view something in the microscope it must be small enough to fit on the glass slide, but for bigger specimen another kind of Microscope or the stereo microscope can be used. But not all microscopes work this way. Because there are different kinds of microscopes, they also have different uses, from the big details in to the tiny details. For bigger objects, a stereo microscope is the best choice; however, the greatest detail can be seen with an electron microscope which uses electron beams and electromagnets

A microscope is used to study things too small to be seen with our naked eyes. A branch of science called Forensic science mainly focuses on the study of finding, identifying, and interpreting the clues and evidence that a criminal will leave at the scene of a crime. The use of microscopes, such as a forensic comparison microscope, by a forensic scientist is to show such evidence or data can be used to solve a crime.

MISSING LINKS

Crimes are sometimes solve with the most unlikely of clues, such as the fragments of teeth, tooth marks, pieces of torn plastic, or even fingernail clippings. The suspects might not even know what traces they leave on the crime scene. Microscopic investigations with the use of forensic microscopes such as a forensic comparison microscope can reveal, for example, whether a tooth is human, the sex and age of the person it came from, and perhaps even his or her occupation. For instance, a carpenter often holds nails and screws between his teeth and in time these leave small notches along the biting edges.

For example, with the use of forensic comparison microscope, a detailed examination of some traces of apple found on a suspect’s clothing may reveal a match with fruit found in the kitchen where a crime has occurred.

A gardener planting some onion bulbs in pots in a greenhouse was attacked from behind. She did not see her assailant but the forensic detectives found fragments of onions skin trapped in the jacket of a suspect. With the help of a forensic comparison microscope, they were able to link them to a fragment of onion skin lying on the ground in the greenhouse.

Another example will be, the suspect had climbed over a wire fence and stolen goods from a warehouse. No fingerprints could be found so it was likely that the criminal wore gloves. While examining the fence, forensic detectives found some pieces of torn leather. These must have been torn from the gloves as the intruder clambered over it. Then a suspect was found possessing a torn pair of industrial plastic gloves this is when they can arrest him because of the evidence found on his possessions.

THREADS, FIBERS, WIRES

Whenever you brush up against a rough or sharp edge, like the corner of a table, tiny threads or fibers from your clothes rub or are pulled off. Under a high power microscope such as a forensic comparison microscope, these can be often be seen to have characteristic shape and smoothness, depending on whether they are natural fibers like cotton or silk, for example, or man-made, such as nylon, acrylic, or polyester. Each clothes manufacturer will usually keep a photographic record of the types of fibers it uses, and the police or the detectives have access on these files. A forensic scientist can use these clues to match them to a suspect’s clothing. Microscopic examination of cut rope fibers and wires with the use of forensic comparison microscopes can also reveal how, and with exactly which tool, the cuts were made.

No matter how smooth the cutting surfaces of a pair of wire-cutters appear, when viewed under a forensic microscope they are clearly rough and jagged. Whenever a piece of wire is severed, these jagged edges leave marks called striations on the wire. Forensic scientist can compare the striations on wire-cutters found at an accident with those, say, bought from various tool manufacturers using forensic comparison microscopes. In this way they can determined the make and model of the cutters and therefore where they were purchased. If they find wire-cutters in a suspect’s possession, microscopic examination of the striations they make in the wire quickly reveal whether or not they were used in the crime. If the storekeeper remembers selling the cutter to the suspect, the criminal will be soon identified thus the case will be solved.

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