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Description
Flashcards by Hibah Albadri, updated more than 1 year ago
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Created by Hibah Albadri
over 6 years ago
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| Question | Answer |
| What is a microscope? | A microscope is an instrument used by scientists to study small specimens up close. |
| Define what a specimen is? | A specimen is an object placed onto the stage of a microscope to be looked at through it. |
| What is magnification? | Magnification is when different instruments are used to make an image look larger than it really is. |
| Name some parts of a microscope? | Some include: 1. Ocular lens 2. Objective lens 3. Stage |
| What is a light microscope? | A light microscope is a microscope that works by passing light through a thin slice of the specimen. |
| Name two types of light microscopes? | Two types include: 1. Monocular microscope 2. Binocular microscope |
| What is the difference between these two microscopes? |
A monocular microscope only has one ocular lens while a binocular microscope has two ocular lenses.
Image:
Ocular (binary/octet-stream)
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| What is an electron microscope? | An electron microscope works on small beams of electrons that magnify the image more than light microscopes do. |
| Up to how many times can an image be magnified through an electron telescope? | Up to a million times magnification. |
| What are two types of electron microscopes? |
TEM and SEM
Image:
Tem (binary/octet-stream)
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| What does TEM stand for? | Transmission electron microscope |
| What does SEM stand for? | Scanning electron microscope |
| Why does a specimen need to be a thin slice to look at it through a light microscope? | A specimen needs to be a thin slice so that the light can pass through to magnify it. |
| What is the maximum magnification for a light microscope? | One thousand times |
| What is the maximum magnification for a stereo microscope? | One hundred times |
| How do you find the total magnification of a microscope? | Multiply the ocular lens magnification by the objective lens magnification. |
| If the objective lens on a microscope had a magnification of x100 and the ocular lens x40, what is the total magnification? | Objective lens magnification: x100 Ocular lens magnification: x40 Total magnification: 100x40= x400 |
| Name four features of a light microscope. | 1. Has a magnification x1000 2. Provides a two dimensional image 3. When you move object it appears to move in the opposite direction. 4. Light passes through the object. |
| Name four features of a stereo microscope. | 1. Has a magnification x100 2. Provides a 3D image 3. The object when moved appears to move the same way. 4. Light reflects off object. |
| Name four features of a TEM. | 1. electrons pass through specimen. 2. black and white but can be coloured to increase contrast. 3. Provides view of inner structure. |
| Name four features of a SEM. | 1. Electrons reflect off specimen. 2. Black and white but can be coloured using computers. 3. Magnifies view greatly. |
| Define fiend of view? | The part of the specimen seen through the microscope. |
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