This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Koehler illumination: a. Is best achieved using a tungsten-halogen lightbulb b. Allows the ... (Read 60 times)

kellyjaisingh

  • Hero Member
  • *****
  • Posts: 540
on: Jun 25, 2018
Koehler illumination:
 
  a. Is best achieved using a tungsten-halogen lightbulb
  b. Allows the brightest amount of light to be in the center of a field
  c. Adjusts for even light across a field
  d. Changes the intensity of the light across a field

Question 2

An object is brought into focus using the 10x objective lens. When the 40x objective lens is moved into position, only a minor adjustment using the fine focus adjustment is required to bring it clearly into focus.
 
  What is the term used to describe lenses with this feature?
 
  a. Parcentric
  b. Achromatic
  c. Plan-achromatic
  d. Parfocal


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

kxciann

  • Sr. Member
  • ****
  • Posts: 356
Reply #1 on: Jun 25, 2018
Answer to Question 1

ANS: C
A microscope with a nonfixed (movable) condenser should be adjusted for Koehler illumination to achieve the best imaging quality possible for the scope. Koehler illumination makes adjustments in various components of the microscope so that even light is present across a field.

Answer to Question 2

ANS: D
When objective lenses are parfocal, only a minor adjustment using the fine focus knob is required to bring an object into focus when moving from one lens to another. Achromatic and plan-achromatic describe how (or if) a lens corrects for the curvature in a field, thus whether or not only part of or an entire field is in focus at the same time. Parcentric means that an image in the center of a field remains close to the center when a different objective lens is brought into position.


kellyjaisingh

  • Member
  • Posts: 540
Reply 2 on: Jun 25, 2018
Wow, this really help

smrtceo

  • Member
  • Posts: 344
Reply 3 on: Yesterday
:D TYSM

« previous next »
 

Did you know?

Many people have small pouches in their colons that bulge outward through weak spots. Each pouch is called a diverticulum. About 10% of Americans older than age 40 years have diverticulosis, which, when the pouches become infected or inflamed, is called diverticulitis. The main cause of diverticular disease is a low-fiber diet.

Did you know?

It is difficult to obtain enough calcium without consuming milk or other dairy foods.

Did you know?

More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.

Did you know?

About 80% of major fungal systemic infections are due to Candida albicans. Another form, Candida peritonitis, occurs most often in postoperative patients. A rare disease, Candida meningitis, may follow leukemia, kidney transplant, other immunosuppressed factors, or when suffering from Candida septicemia.

Did you know?

Though newer “smart” infusion pumps are increasingly becoming more sophisticated, they cannot prevent all programming and administration errors. Health care professionals that use smart infusion pumps must still practice the rights of medication administration and have other professionals double-check all high-risk infusions.

Kranz and Lörz first achieved in vitro plant fertilization Kranz and Lörz first achieved in vitro plant fertilization
Kranz and Lörz first achieved in vitro plant fertilization Kranz and Lörz first achieved in vitro plant fertilization
An example of sodium balance achieved by the coordinated actions of three hormones. An example of sodium balance achieved by the coordinated actions of three hormones.
The monthly changes of angle between the direction of illumination by the Sun and viewing from Earth The monthly changes of angle between the direction of illumination by the Sun and viewing from Earth
Energy Balance Is Achieved When Energy (Calories) In Equals Energy (Calories) Out Energy Balance Is Achieved When Energy (Calories) In Equals Energy (Calories) Out
In a simulation, the path of a new aircraft after it has achieved weightlessness In a simulation, the path of a new aircraft after it has achieved weightlessness
Video: Renin/Angiotensin (water gain from urine & Na ion and water reabsorption)

For a complete list of videos, visit our video library