20679777
Description
Flashcards by Nimco Said Mohamed, updated more than 1 year ago
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Created by Nimco Said Mohamed
almost 5 years ago
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| Question | Answer |
| What is the difference between magnified, microscopes, microscopic? | Magnified, make something appear larger than it is. Microscopic, objects that are only seen using a microscope. Microscopes, an optical instrument used for viewing very small objects |
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How does a light microscope work?
Image:
Light (binary/octet-stream)
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Light from a mirror or a lamp passes through a specimen or object. The specimen that is being looked at must be very thin so the light passes through a series of lenses then it makes the specimen appear bigger |
| Magnified DEFINITION | Make something appear larger than it is. |
| Microscopes DEFINITION | An optical instrument used for viewing very small objects |
| Microscopic DEFINITION | Objects that are only seen using a microscope. |
| How does a stereo microscope work? | A stereo or a dissecting microscope uses reflected light from the object. It magnifies at a low power hence ideal for amplifying opaque objects. As it uses light that naturally reflects from the specimen. |
| Parts of a stereo microscope | The eyepiece, focus knob, top lighting, lighting controls, stage clips, stage plate, bottom lighting, stereo head, diopter |
| 2 differences between Monocular or Binocular microscope & Stereo microscope | 1 Monocular or Binocular microscope provides a two-dimensional image of the |
| A micrometre | one-thousandth of a millimetre, or one-millionth of a meter |
| When is a micrometre mostly used? | It is used by scientists to measure microscopic objects |
| How do electron microscopes work? | electrons microscopes use beams of tiny particles called electrons instead of light and can magnify up to a million times |
| What are the 2 types of electron microscopes? | 1: transmission electron microscopes (TEM) 2: scanning electron microscopes (SEM) |
| Qualities of TEM | 1 -the specimen is a very thin slice 2 -electrons pass through the specimen 3 -provides a view of the inner structure of the specimen such as a cell |
| Qualities of SEM | 1 -specimen can be anything; no need to slice 2 -electrons reflect off the surface of the specimen 3 -gives greatly magnified views of objects |
| 1 comparison of TEM and SEM | TEM image is black and white but can be cloured to increase contrast SEM image is black and white but can be given false colour using computers |
| Qualities of a Monocular or Binocular microscope (MB) | 1 -provides a two-dimensional image of the specimen 2 -light passes through the specimen 3 -when you move an object, the image appears to move in the opposite direction |
| Qualities of a stereo microscope | 1 -provides a three-dimensional image of the specimen 2 -light reflects off the specimen 3 -when you move the object, the image appears to move in the same direction |
| The maximum magnification achieved by light microscopes is ... | about × 1000 |
| Why must the specimen being looked at must be very thin? ( LIGHT MICROSCOPE ) | so light can pass through it easily |
| Why is a light microscope a monocular microscope? | It only has one eyepiece or ocular lens |
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