FIS 312 - Final Exam questions with
verified answers A+ rated
What is the most commonly measured property of glass? - correct answer ✔✔Refractive Index
Man-made fiber type from naturally occurring polymers - correct answer ✔✔Regenerated
fibers
This is the name given to fibers manufactured with continuous lengths - correct answer
✔✔Filament Fibers
The full name of the database used at the local level for submitted firearm evidence - correct
answer ✔✔NIBIN (National Integrated Ballistic Information Network)
The full name of a computerized system for images of unidentified and known bullets and
cartridge cases - correct answer ✔✔IBIS (Integrated Ballistics Identification System)
Collection of a known source material, taking into account all possible variation - correct answer
✔✔Representative Sampling
The light-bending ability of a medium - correct answer ✔✔Refractive Index
We utilize crossed-polars to measure this optical properties - correct answer ✔✔Birefringence
This type of lens generates a virtual image through the divergent light rays - correct answer
✔✔negative/divergent/concave
,Shortest distance between two points that can be distinguished as separate entities - correct
answer ✔✔Resolution/Resolving distance
Fractures extending outward form point of impact - correct answer ✔✔Radial cracks
These are the three primary components of glass - correct answer ✔✔Silicone dioxide (sand),
calcium and magnesium oxide (limestone), and sodium carbonate (trona)
**ARE NOT WRITTEN - MC/Select all that apply**
Part of the firearm which strikes the primer of a cartridge to initiate ignition - correct answer
✔✔Firing Pin
Human hair typically exhibits only this scale structure - correct answer ✔✔Imbricate
The portion of a specimen in focus - correct answer ✔✔Depth of field
This structure is located within the hair follicle and drives epithelial cell differentiation - correct
answer ✔✔Dermal Papilla
Resting stage of hair growth - correct answer ✔✔Telogen stage
Synthetic material used to dull manufacturing fibers - correct answer ✔✔Delustrant particles
This theory describes the need for objective lenses to capture as much divergent light as
possible for best resolution - correct answer ✔✔Abbe's theory of imaging
This method of microscopy can form 3D images via optical sectioning - correct answer
✔✔Confocal Microscopy
,A higher numerical aperture creates smaller what? - correct answer ✔✔- Airy disks - less
overlap between these airy disk - more resolution
- Closer they are together - better resolution - can see more detail
This objective lens type has the highest level of correction - correct answer ✔✔Apochromat
A material that has different optical properties depending on the direction of light propagation -
correct answer ✔✔Anisotropic --> Can measure birefringence
The most common type of natural fibers - correct answer ✔✔Cotton
The direction of strands in a helix about the rope or twine axis - correct answer ✔✔Lay (lay of a
rope/twine)
The conjugate plane is considered the arthroscopic viewing mode - correct answer ✔✔The
image-forming series
Which of the following types of microscopes deals primarily with reflected light, versus
transmitted light
-Stereomicroscope
-Compound microscope
-Comparison microscope
-Scanning-electron microscope - correct answer ✔✔Stereomicroscope
Who is considered the "father of forensic microscopy" - correct answer ✔✔Dr. Walter McCrone
Positive lenses are: - correct answer ✔✔Convex, Convergent
, Spherical aberrations occur when: - correct answer ✔✔Light is deviated to a different focal
point depending on where in the lens it passes through
In the equation for Numerical aperture (N.A), what does 0(theta) stand for? - correct answer
✔✔1/2 the angle of cone of light reaching the objective
What is the working distance of an objective? - correct answer ✔✔Distance between the
bottom of the objective lens and specimen
Above a numerical aperture of 1, what special technique must we use to properly visualize a
sample? - correct answer ✔✔oil-immersion
There are 3 diaphragms located within our microscopes. One is a FIXED diaphragm that we
cannot adjust. Where is this located? - correct answer ✔✔The eyepiece
Higher Numerical aperture objectives typically result in which of the following?
a. smaller airy disks; lower resolving power
b. smaller airy disks; higher resolving power
c. larger airy disks; lower resolving power
d. larger airy disks; higher resolving power - correct answer ✔✔b. smaller airy disks; higher
resolving power
Birefringence is also referred to as: - correct answer ✔✔Double refraction
Which filter is placed between the light source and specimen? - correct answer ✔✔Polarizer
verified answers A+ rated
What is the most commonly measured property of glass? - correct answer ✔✔Refractive Index
Man-made fiber type from naturally occurring polymers - correct answer ✔✔Regenerated
fibers
This is the name given to fibers manufactured with continuous lengths - correct answer
✔✔Filament Fibers
The full name of the database used at the local level for submitted firearm evidence - correct
answer ✔✔NIBIN (National Integrated Ballistic Information Network)
The full name of a computerized system for images of unidentified and known bullets and
cartridge cases - correct answer ✔✔IBIS (Integrated Ballistics Identification System)
Collection of a known source material, taking into account all possible variation - correct answer
✔✔Representative Sampling
The light-bending ability of a medium - correct answer ✔✔Refractive Index
We utilize crossed-polars to measure this optical properties - correct answer ✔✔Birefringence
This type of lens generates a virtual image through the divergent light rays - correct answer
✔✔negative/divergent/concave
,Shortest distance between two points that can be distinguished as separate entities - correct
answer ✔✔Resolution/Resolving distance
Fractures extending outward form point of impact - correct answer ✔✔Radial cracks
These are the three primary components of glass - correct answer ✔✔Silicone dioxide (sand),
calcium and magnesium oxide (limestone), and sodium carbonate (trona)
**ARE NOT WRITTEN - MC/Select all that apply**
Part of the firearm which strikes the primer of a cartridge to initiate ignition - correct answer
✔✔Firing Pin
Human hair typically exhibits only this scale structure - correct answer ✔✔Imbricate
The portion of a specimen in focus - correct answer ✔✔Depth of field
This structure is located within the hair follicle and drives epithelial cell differentiation - correct
answer ✔✔Dermal Papilla
Resting stage of hair growth - correct answer ✔✔Telogen stage
Synthetic material used to dull manufacturing fibers - correct answer ✔✔Delustrant particles
This theory describes the need for objective lenses to capture as much divergent light as
possible for best resolution - correct answer ✔✔Abbe's theory of imaging
This method of microscopy can form 3D images via optical sectioning - correct answer
✔✔Confocal Microscopy
,A higher numerical aperture creates smaller what? - correct answer ✔✔- Airy disks - less
overlap between these airy disk - more resolution
- Closer they are together - better resolution - can see more detail
This objective lens type has the highest level of correction - correct answer ✔✔Apochromat
A material that has different optical properties depending on the direction of light propagation -
correct answer ✔✔Anisotropic --> Can measure birefringence
The most common type of natural fibers - correct answer ✔✔Cotton
The direction of strands in a helix about the rope or twine axis - correct answer ✔✔Lay (lay of a
rope/twine)
The conjugate plane is considered the arthroscopic viewing mode - correct answer ✔✔The
image-forming series
Which of the following types of microscopes deals primarily with reflected light, versus
transmitted light
-Stereomicroscope
-Compound microscope
-Comparison microscope
-Scanning-electron microscope - correct answer ✔✔Stereomicroscope
Who is considered the "father of forensic microscopy" - correct answer ✔✔Dr. Walter McCrone
Positive lenses are: - correct answer ✔✔Convex, Convergent
, Spherical aberrations occur when: - correct answer ✔✔Light is deviated to a different focal
point depending on where in the lens it passes through
In the equation for Numerical aperture (N.A), what does 0(theta) stand for? - correct answer
✔✔1/2 the angle of cone of light reaching the objective
What is the working distance of an objective? - correct answer ✔✔Distance between the
bottom of the objective lens and specimen
Above a numerical aperture of 1, what special technique must we use to properly visualize a
sample? - correct answer ✔✔oil-immersion
There are 3 diaphragms located within our microscopes. One is a FIXED diaphragm that we
cannot adjust. Where is this located? - correct answer ✔✔The eyepiece
Higher Numerical aperture objectives typically result in which of the following?
a. smaller airy disks; lower resolving power
b. smaller airy disks; higher resolving power
c. larger airy disks; lower resolving power
d. larger airy disks; higher resolving power - correct answer ✔✔b. smaller airy disks; higher
resolving power
Birefringence is also referred to as: - correct answer ✔✔Double refraction
Which filter is placed between the light source and specimen? - correct answer ✔✔Polarizer
