Lab Exam 1

Question 0

What is the ocular lens?

Answer 0

Lenses you look through

Question 1

What is the formula for image magnification ?

Answer 1

Objective power x ocular power

Question 2

What is the objective lens?

Answer 2

The lens that is closest to the object

Question 3

What is the revolving nose piece?

Answer 3

It holds the objectives

Question 4

What is the coarse focus knob?

Answer 4

Raises and lowers the stage allowing you to focus the image

Question 5

What is the fine focus knob?

Answer 5

Raises the stage by tiny amounts and brings the image into sharp focus

Question 6

What is the stage?

Answer 6

Holds the glass microscope slide containing the specimen

Question 7

What is the light source

Answer 7

Built into the microscope

Question 8

What is the arm?

Answer 8

Let’s you carry the microscope with one hand, while the other holds the microscope underneath

Question 9

What is the iris diaphragm?

Answer 9

Controls the amount of light entering the lens system

Question 10

What is the substage condenser?

Answer 10

Focuses light on the subject

Question 11

What objective is the nosepiece supposed to be on when you remove a slide?

Answer 11

4x

Question 12

What is the objective power of the scanning objective?

Answer 12

4x

Question 13

What is the objective power of a medium power objective?

Answer 13

10x

Question 14

What is the objective power for a high power objective?

Answer 14

40x

Question 15

What is the objective power of an oil immersion objective?

Answer 15

100x

Question 16

What microscope allows for the largest image magnification?

Answer 16

Compound

Question 17

What happens to the field of view as you change it from low to high magnification!

Answer 17

The higher magnification the smaller the field of view

Question 18

What is the body tube

Answer 18

The body tube is the tube part of the oculars

Question 19

What is the shape of cocci?

Answer 19

Small spheres

Question 20

What is the bacilli shaped as?

Answer 20

Rod shaped

Question 21

What is spirilla shaped like?

Answer 21

Corkscrew shaped

Question 22

What color is gram positive bacteria?

Answer 22

Violet

Question 23

What color is gram negative bacteria?

Answer 23

Pink/red

Question 24

What is the formula for Magnification of a drawing?

Answer 24

Drawing size (um) ________________ Measured cell size (um)

Question 25

How do you convert from mm to um?

Answer 25

Multiply by 1000. | Ex: 2.7mm x 1000 = 2700um

Question 26

How do you measure the length of something?

Answer 26

Put it on leftmost side and see how much space is takes up and multiply it by how big the field diameter is.

Question 27

How do you calculate field diameter?

Answer 27

4(x) x 5mm = 10(next objective) x fd10x | Fd10x = 4 x 5mm /10x = 2mm

Question 28

How do you calculate grams of solute?

Answer 28

Molecular weight (grams/mole) x volume (litre) x molarity (moles/litre)

Question 29

What is the formula for preparing dilutions?

Answer 29

M1v1 = m2v2 Final m solution x final liter Divided by stock solution