20703441
Description
Flashcards by Sana Mohmoodi, updated more than 1 year ago
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Created by Sana Mohmoodi
almost 5 years ago
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| Question | Answer |
| what is the meaning of microscope? | An instrument used to make small things look bigger |
| What is the meaning of specimen? | The objest being looked at through a microscope |
| What is an image? | An image is what is seen through a microscope |
| What is a light microscope? | A microscope that uses light to reveal the image |
| What are the two types of light microscopes? | Monocular microscoprs and binocular microscopes |
| explain a stereo microscope | A binocular microscope that creates a three-dimensional image |
| Explain objective lens | The lens of the microscope closest to the stage |
| Why is a stereo microscope used to disect and examine living things? | Because the space between the objective lens and specimen is greater than other microscopes and it shows things in three dimensions. |
| Compare the image of a stereo microscope and Monocular or binocular microscopes | In monocular or binocular microscropes, when you move the specimen to one direction, the image appears to move the other direction. But the image of a stereo microscope the opposite happens. |
| Explain microfication | The amount by which the image is magnified compared to the real object (specimen) |
| Give an example of magnification | so if the microscope has a magnification on x10, then the image is ten time bigger that the actual object. |
| What is the feild of view? | The amount of specimen seen through an object. As magnification increases, the field of view becomes smaller. |
| What is the maximum magnification achieved by light microscopes? | It is about x1000. At this magnification some of the largest bacteria is just visible |
| What is the maximum magnification achieved by stereo microscopes? | It is x100 and is lower than light microscopes |
| What is a micrometre equal to? | a micrometre is one-thousandth of a millimetre one millionth of a metre. |
| What is a micrometre used for? | It is used by scientists to measure microscopic objects. |
| Are electron microscopes more powerful or are or light microscopes? | Electron microscopes are |
| What is an electron microscope? | It is a type of microscope that uses beams or electrons to magnify up to a million times. |
| Name the two types of electron microscopes | Transmission electrom microscopes and scanning electron microscopes. |
| What is the difference between TEM and SEM when it comes to the specimen? | In TEM, the electrons pass through the specimen while in SEM the electrons reflect of the surface of the specimen. |
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