Ocular Micrometer

Question 1

• It is a technique used to measure the size of microscopic objects

Answer 1

Micrometry

Question 2

Micrometry

Principle:
-Calibration of the ocular micrometer using the______

Answer 2

stage micrometer

Question 3

• A glass disc with____ equal divisions or lines on it but with no absolute value and it is placed in the ocular of the microscope.

Answer 3

Ocular micrometer

100

Question 4

• Used to calibrate Ocular micrometer
• It looks like a microscope slide but has a standard scale etched into it.

Answer 4

Stage micrometer

Question 5

• The smallest division are_____ in length (0.01 mm= 10 um)

Answer 5

0.01 mm

Question 6

The size of microorganisms is an essential tool for its:

Answer 6

characterization
classification
identification

Question 7

In the field of parasitology, it helps in differentiating species belonging to the same genus which will consequently lead to correct diagnosis of parasite infection

Answer 7

sizes of parasites

Question 8

are flat glass discs on which a line scale divided into 50 or 100 small divisions has been etched.

Answer 8

Ocular micrometers

Question 9

T or F

the distance between each small division is unknown.

Answer 9

TRUE

Question 10

calibration is a must with the aid of an instrument with a known measurement called —

Answer 10

stage micrometer

Question 11

the size of the_____ remains the same regardless of the magnification of the objective lens.

Answer 11

ocular “ruler”

Question 12

Stage micrometer

The scale is a total of____ in length and is divided into____ increments and further subdivided into____ (10um) increments.

Answer 12

1 mm

0.1 mm

0.01 mm

Question 13

T or F

size of the ocular “ruler” remains the same regardless of the magnification of the objective lens.

Answer 13

True

Question 14

T or F

The object viewed will increase in size with the higher objective lens, but the ocular micrometer scale remains unchanged

Answer 14

True

Question 15

depending on the_______ of the objective lens being used, the divisions on the scale represent different distances.

Answer 15

magnification

Question 16

To determine what the divisions on the scale represent, units must be assigned using a “known” scale. This in turn is referred to as a______.

Answer 16

calibration

Question 17

Micrometer slide

The scale is a total of_____ in length and is divided into____ increments and further subdivided into_____ or _____

Answer 17

1 mm

0.1 mm

0.01 mm (10um) increments

Question 18

At higher magnifications, the thickness of the etched line may be so great that you need to look for superimposition of either the ____ or ____of the individual lines.

Answer 18

left or right edge

Question 19

In order to determine how large one ocular unit is simply divide the ______by the number of_____

Answer 19

stage micrometer units

ocular divisions

Question 20

It is possible to determine the value of one ocular space with the use of a_______ instead of a stage micrometer.

The procedure is essentially similar to the procedure above except that the ocular lines are made to coincide with the lines in the ______ in the area used for red _____count determination.

Answer 20

hemocytometer

blood cell