What is a parfocal - Study guides, Class notes & Summaries

Objective of oil immersion lens Correct Answer-100X Resolving power becomes _____ as magnification of the objective lens _______ Correct Answer-Greater, increases The light microscope can distinguish two points that are at least _____ um apart Correct Answer-0.2 What is used to sterilize heat sensitive liquids? Correct Answer-Filtration The streak plate technique uses spatial dilution (Increases the space b/t organisms) to create Correct Answer-pure colonies The component of MacCo...

What is the lower limit of resolution with the light microscope? Correct Answer-.2µm Define Parfocal: Correct Answer-A slide in focus will still be in focus to nearly in focus on a different objective. The magnification of the oil immersion objective is: Correct Answer-100x The total magnification of the oil immersion is: Correct Answer-1000x, Product of the magnification of the ocular (10x) and the objective lens (100x). Resolving power: Correct Answer-Ability of a microscope to di...

*magnification of oil immersion lens Correct Answer-100x 1.25 Lower limit of resolution with a light microscope Correct Answer-.2 um What does parfocal mean? Correct Answer-When you have the object in focus with one objective. It will be visible on all objectives with just a minor adjustment from the fine adjustment knob - a specimen in focus under the low power objectives (4x or 10x) should be nearly in focus under the oil immersion objective as well Relationship between resolving po...

Microbiology LAB Exam 1 with Complete Solutions Microscope- The Condenser focuses the light ging into the objective lens Microscope- The Iris Diaphragm adjusts the amount of light going into the objective lens Microscope- Nosepiece holds the objective lenses and rotates to change from one objective to another Microscope- Coarse Objective Knob moves the stage larger distances to help get the object in focus Microscope- Fine Adjustment Knob moves the stage smaler increments to help get the obj...

BIO 390 Lab Exam Questions With 100% Correct Answers What is the primary use of slants? - answerTo provide a solid growth surface that is easier to store/transport. What is the primary use of deeps? - answerTo allow anaerobic bacteria to grow. What is the primary use of broths? - answerTo grow large numbers of bacteria in a small space. Can we determine whether a broth culture is pure by visually inspecting it without a microscope? - answerNo Can we determine whether a deep culture is p...

Who is the father of microscopy? Antonie van Leeuwenhoek Lamp: produces visible light to illuminate the specimen Condenser: collects light and directs it through the stage opening (converges or focuses the rays of light to a single point) Iris diaphragm: regulates the amount of light available to the objective lens Factors that affect microscope function: Resolving power, numerical aperture, magnification, working distance Resolving power: ability of a microscope to differentiate two ...

VCP Lab Exam 1 Study Guide Questions & Answers 2024/2025 Humans can become infected with the _______ tapeworm by ingesting poorly cooked pork. - ANSWERSTaenia solium Large equine strongyles cause damage through larval tissue migration through the mesenteric artery or liver. - ANSWERSTrue The parasite ova that could be identified in sputum. - ANSWERSEucoleus aerophilus Fleas have a _______ stage life cycle. - ANSWERSFour A parfocal compound light brightfield microscope keeps the ...

BIO 390 Lab Exam Questions With 100% Correct Answers What is the primary use of slants? - answerTo provide a solid growth surface that is easier to store/transport. What is the primary use of deeps? - answerTo allow anaerobic bacteria to grow. What is the primary use of broths? - answerTo grow large numbers of bacteria in a small space. Can we determine whether a broth culture is pure by visually inspecting it without a microscope? - answerNo Can we determine whether a deep culture is p...

If the total magnification of a microscope can be increased by simply adding more lenses, why are bright-field light microscopes not outfitted to magnify things greater than 1300×? correct answers Because the resolution limit for a light microscope is about 0.2μm, magnifications above this will not produce clear images. Fluorescent microscopy differs from other types of light microscopy in that it requires correct answers the use of an ultraviolet light source. Why is it important to cen...

What is a parfocal? correct answer: ~Ability of a microscope to switch powers with minor adjustments in focus ~Ability to switch from one objective to another without altering the focus What is the definition of resolving power? correct answer: The ability of an optical instrument to separate or distinguish small or closely adjacent images. What is the total magnification through a 10x ocular & 100x objective? correct answer: 1,000x How do you calculate the scale of a drawing? corre...