answer the questions 17. Chemical methods for developing latent fingerprints mus
ID: 291821 • Letter: A
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17. Chemical methods for developing latent fingerprints must be used in the following sequence: a. lodine, physical developer, ninhydrin b. lodine, ninhydrin, physical developer c, Ninhydrin, iodine, physical developer d. Ninhydrin, physical developer, iodine. e. None of the above. S. A point-by-point comparison of a fingerprint 'smust be demonstrated in order to prove d. Bifurcations e. Ridges a. Minutiac b. Pattern c. Protein composition 19. A compound mieroscope is equipped with two objective lenses (10x and 45x) and has a 10x ocular lens, The highest magnification atlainable with this instrument is: a. 65x b. 100x c. 650x e. 4500x 20. Which microscope is best suited to the study of birefringent minerals and fibers? d. Comparison e. Compound tereoscopiC b. Microspectrophotometer c. Polarizing 21. Which microscope is most likely to be used as a tool for determining whether or not a bullet was fired from a specifie gun d. Stercoscopic e. Comparison a. Compound c. SEM 22. A microscope uses a combination of to magnify an image a. Stages b. Mirrors c. Lenses d. Confocals e. Windows 23. A type of image that cannot be viewed directly is called a(n) mage a. Real b. Imaginary c. Reflected d. Virtual e. Unreal 24. The most important tool of the firearms examiner is the d. Polarizing microscope e. Microspectrophotometer. b. Comparison microscope. c. Stereoscopic microscopeExplanation / Answer
17) The correct order is Iodine, Ninhydrin, Physical Developer
Iodine reacts with oils to produce a temporary yellow-brown reaction. Ninhydrin reacts with amino acids to produce a purple color. Physical Developer reacts with salt from sweat secretions to produce a material which turns gray when exposed to light
18) ridge characteristics/minutiae
19) Highest magification = magnifying power of the objective lens multiplied by the eyepiece lens
==> 45x10 = 450x
20) Polarizing microscope is best suited for birefringent minerals & fibres because these are anisotropic materials & can be studied under a polarizer, which increases the quality of image contrast more like dark or brightfield illumination,DIC, fluorescence and phase contrast.
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