The Microscope | Quizalize

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The Microscope | Quizalize

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The Microscope

Quiz by dave kistler

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Q 1/20
Score 0
Contains a lens that magnifies about 10x
30
eyepiece
Q 2/20
Score 0
Supports (holds up & in place) the lenses; used to carry the scope
30
arm

20 questions

Q.

Contains a lens that magnifies about 10x

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1

30 sec

Q.

Supports (holds up & in place) the lenses; used to carry the scope

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2

30 sec

Q.

contains lenses for magnification; ALWAYS begin focusing on LOW power

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3

30 sec

Q.

holds the slide in place on the stage

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4

30 sec

Q.

moves the stage up & down in order to bring the image into view; use only when scope is on low power

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5

30 sec

Q.

platform that holds the slide & specimen; Always begin focusing with stage all the way down

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6

30 sec

Q.

controls the amount of light that passes through the stage

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7

30 sec

Q.

moves the stage very little to sharply focus the image, usually under medium or high power

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8

30 sec

Q.

provides the light for the microscope

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9

30 sec

Q.

supports the entire microcope, used to carry the scope at the bottom

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10

30 sec

Q.

power of the eyepiece lens times power of the objective lens

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11

30 sec

Q.

rectangular in shape; colorless glass used to support a specimen

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12

30 sec

Q.

square shaped (1/4 size of slide) colorless plastic placed on top of a wet mount slide.

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13

30 sec

Q.

temporary way to prepare a slide. 1-2 drops of water or stain placed on the slide with the specimen; always uses a cover slip.

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14

30 sec

Q.

use light & a series of lenses to magnify the image; produces a 2D image; small usually non living specimen required.

15

30 sec

Q.

low power magnification

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16

30 sec

Q.

medium power magnification

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17

30 sec

Q.

high power magnification

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18

30 sec

Q.

Holds the objectives and can be rotated to change the magnification

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19

30 sec

Q.

An opening, especially one that admits light found in the center of the stage

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20

30 sec

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Parts of the Microscope
8 DIWA How the Microscope Redefined Life
Cell Theory The microscopes we use today are far more complex than those used in the 1600s by Antony van Leeuwenhoek, a Dutch shopkeeper who had great skill in crafting lenses. Despite the limitations of his now-ancient lenses, van Leeuwenhoek observed the movements of protista (a type of single-celled organism) and sperm, which he collectively termed “animalcules. ” In a 1665 publication called Micrographia, experimental scientist Robert Hooke coined the term “cell” for the box-like structures he observed when viewing cork tissue through a lens. In the 1670s, van Leeuwenhoek discovered bacteria and protozoa. Later advances in lenses, microscope construction, and staining techniques enabled other scientists to see some components inside cells. image Figure 4.3.1 : Structure of an Animal Cell: The cell is the basic unit of life and the study of the cell led to the development of the cell theory. By the late 1830s, botanist Matthias Schleiden and zoologist Theodor Schwann were studying tissues and proposed the unified cell theory. The unified cell theory states that: all living things are composed of one or more cells; the cell is the basic unit of life; and new cells arise from existing cells. Rudolf Virchow later made important contributions to this theory. Schleiden and Schwann proposed spontaneous generation as the method for cell origination, but spontaneous generation (also called abiogenesis) was later disproven. Rudolf Virchow famously stated “Omnis cellula e cellula”… “All cells only arise from pre-existing cells. “The parts of the theory that did not have to do with the origin of cells, however, held up to scientific scrutiny and are widely agreed upon by the scientific community today. The generally accepted portions of the modern Cell Theory are as follows: The cell is the fundamental unit of structure and function in living things. All organisms are made up of one or more cells. Cells arise from other cells through cellular division. The expanded version of the cell theory can also include: Cells carry genetic material passed to daughter cells during cellular division All cells are essentially the same in chemical composition Energy flow (metabolism and biochemistry) occurs within cells
History of the Microscope
Parts and function of the microscopes
Function and ID of the Parts of the Microscope
8 Grade 7 Science Lesson 8 How the Microscope Redefined Life
Parts of Microscope 1. Arm It is in the back of the microscope and supports the objectives and ocular. Also, it is the part that we use to carry or lift it. 2. Base It’s the bottom of the scope. In addition, it houses the light source and the back section of base acts as a handle to carry the scope. 3. Course Focusing Knob We use it to adjust the position of objective lenses. Also, this should be done keeping in mind that the objective should not hit the slide. In addition, it should be stopped when the object is completely visible through the ocular. 4. Fine Focusing Knob We use it to bring the specimen in perfect focus once the specimen is visible through the course-focusing knob. Also, focus slowly to avoid contact between the objective and the specimen. 5. Illuminator It is the light source of the microscope. 6. Numerical Aperture or Objective lens It is found in a compound scope and is the lens that is closest to the specimen. 7. Ocular Lens This is the lens closest to the viewer in a compound light microscope. 8. Oil immersion Lens This is a 100x (100 times) objective lens. Also, this lens is small in order to attain high resolution and magnification. Furthermore, due to its size, it is important for the lens to get as much light as possible. Moreover, by immersion of lens in oil it eliminates the refraction of light, it happens because the glass and oil have almost the same refractive index. Most noteworthy, in this way the light is maximized and gives the clearest image. Besides, It oil immersion lens is used without oil then the produced Image will become unclear and has a poor resolution.