FRSC 365

FRSC 365 EXAM 1 PART 1 QUESTIONS AND VERIFIED ANSWERS LATEST UPDATE why microscopes are important because they are the most utilized in forensics what is light light is a wave Lightwaves the movement of light, point A to point B waves have 2 fields electric and magnetic field wave motion sinusoidal fashion wavelength of light is going to affect the visible region Amplitude Height of a wave wavelength The distance between two corresponding parts of a wave one oscillation Frequen...

FRSC365 EXAM 3 QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED GRADED A++ how do you complete a hair analysis? compare the sample hair to known suspect hairs what are you determining in a hair analysis? hair or fiber? animal or human? if animal, what species? if a hair is human, what are you determining? color, race, body region, growth phase (forcibly removed, PCR suitable) what are the three major components of the hair shaft? medulla, cortex, cuticle what muscle makes the ha...

FRSC 365 TEST 1 EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS Refractive Index How the speed of light changes in a medium as compared to the speed of light in a vacuum Four actions of light Refract, absorb, diffract, and reflect Snell's Law n1sin(theta1)=n2sin(theta2) Airy disc formula d=0.61 * wavelength/NA Four abberations Chromatic, distortion, spherical, and curvature of field Corrections for aberrations Plano, Achromat, Semi-apochromat, and apochromat Advantages of th...

FRSC365: EXAM 1 QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED GRADED A++ is light treated as a particle or wave? both, but mostly a wave what is the speed of light? 3*10^8 what is the direction of propagation? the direction that light travels what are the three things that a good microscope should do? magnify, have good resolution, have good contrast what is monochromatic light? light that is one color (all same wavelength) what is polarized light? light that oscillates all ...

FRSC365 EXAM 3 QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS GRADED A++ Why do we use dark field? if samples are thin and/or colorless Cuticle outermost layer of hair scale pattern of cuticle coronal, spinous, imbricate cortical fusi air/fluid pockets. most abundant near root Ovoid bodies large clumps of undispersed pigment Where is the pigment found in hair? cortex Medulla the central core of a hair types of medulla patterns absent, fragmentary, discontinuous, continuous type...

FRSC 365 TEST 4 SET 2 EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED why can't our eyes differentiate between random and polarized light human vision isn't sensitive to the direction of the light's vibration what do polarized filters do block horizontal light and reduce glare what causes birefringence non uniform spatial distribution in the crystal lattice of anisotropic materials what determines if a material has birefringence its orientation of polarized light rel...

FRSC365 EXAM 2 QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED GRADED A++ what are a few key differences between compound and stereomicroscopes? - no 3D view - smaller working distance - smaller field of view what are the main components of a CM? eyepiece, head, stand, revolving nosepiece, objective lens, stage, condenser, condenser focus knob, field diaphragm, base, fine focus knob, coarse focus knob what is always the magnification of the eyepiece? 10X what is the observation...

EXAM 1-FRSC365 QUESTIONS AND VERIFIED CORRECT ANSWERS GRADED A++ What is light? -has both properties of a particle and a wave, called duality of light -has perpendicular electric and magnetic field What resolution is the best light microscope limited to? limited to 200 nm what causes contrast? scattering of waves and depends on interference to give different shades of gray what do the best microscopes need? -the most resolution:more detail -magnification -good contrast Why do you n...

FRSC 365 TEST 1 EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED In the visible light spectrum, _____________ will determine the color, ___________ will determine the intensity of color wavelength, amplitude 3 tasks of a microscope magnification, resolution, contrast 4 types of light monochromatic, polarized, coherent, collimated monochromatic light light having a single wavelength or frequency polarized light light that vibrates in only one direction coherent light mono...

FRSC365 TEST 3 ACTUAL EXAM QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS VERIFIED GRADED A++ if n of a specimen ~ = n of mounting medium, the image will be transparent darkfield microscopy helps brighten the specimen against a dark background for brightfield, the intensity of a sample is the result of interference between deviated and undeviated light through the sample for darkfield, the undeviated rays from the condenser are blocked, creates cone of light for darkfield, only the lig...