20703137
Description
Flashcards by Khadija Syed, updated more than 1 year ago
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Created by Khadija Syed
about 4 years ago
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| Question | Answer |
| What is a microscope? | An instrument used to magnify small things in order to make them more visible to us. |
| What is microscopic used to describe? | Microscopic is used to describe objects that can only be seen using a microscope. |
| What is a specimen? | The object being looked at through a microscope. |
| What is an image? | An image is what is seen through using the microscope. |
| What are ocular lenses? | The lens of the microscope closest to your eye, also known as the eyepiece. |
| What is a light microscope? | A light microscope is a microscope that uses light to reveal the image. |
| What is a monocular microscope? | A monocular microscope is a type of light microscope which has only one eyepiece or ocular lens. |
| What is a binocular microscope? | A light microscope with two eyepieces or ocular lenses is known as a binocular microscope. |
| What is a stereo microscope? | A stereo microscope is a binocular microscope (2 eyepieces) focusing on the same point from different angles so the image is seen in three dimensions. |
| What is the objective lens? | The lens of the microscope closest to the stage (where the specimen is placed). |
| What is magnification? | The amount by which the image is magnified (made bigger) compared to the real size of the object (specimen). |
| What is the field of view? | The amount of the specimen seen through the microscope. (More magnification means you are seeing less of the specimen). |
| What is a micrometre? | A micrometre is either one-thousandth of a millimetre or one-millionth of a metre. |
| What is an electron microscope? | An electron microscope is a type of microscope that uses beams of electrons to magnify up to a million times. |
| What are the 2 types of electron microscopes? | The 2 types of electron microscopes are: 1. (TEM) transmission electron microscope 2. (SEM) scanning electron microscope |
| What is the difference between TEM and SEM? | TEM's specimen is a thin slice, electrons pass through specimen, provides view of inner structure, image b&w can be coloured to increase contrast. SEM's specimen can be anything, electrons reflect off surface of specimen, gives magnified views of objects, images b&w but can be given false colour using computers |
| What are two types of lenses found in a light microscope? | 2 lenses found in a light microscope : 1. Ocular lenses 2. Objective lenses |
| Definition of dissect? | To dissect is to cut apart a dead plant or animal to study and observe it. |
| 3 differences between monocular or binocular (mon or bin) microscopes and stereo microscopes? | 1. Monocular and binocular provide a 2D image of the specimen whereas the stereo microscope provides a 3D one. 2. In the stereo microscope when the object is moved the image appears to move in the same direction, whereas in the other 2 it appears to move in the opposite direction. 3. Stereo has a max magnification of x100, other 2 microscopes have a max of x1000. |
| How is the total magnification of a microscope calculated? | Total magnification = ocular lens magnification x objective lens magnification. |
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