Flashcards
Unit 2.1
Flashcards do conjunto (22)
- 1What is a microscope?A microscope is an instrument used by scientists to study small specimens up close.
- 2Define what a specimen is?A specimen is an object placed onto the stage of a microscope to be looked at through it.
- 3What is magnification?Magnification is when different instruments are used to make an image look larger than it really is.
- 4Name some parts of a microscope?Some include:
1. Ocular lens
2. Objective lens
3. Stage
- 5What is a light microscope?A light microscope is a microscope that works by passing light through a thin slice of the specimen.
- 6Name two types of light microscopes?Two types include:
1. Monocular microscope
2. Binocular microscope - 7What is the difference between these two microscopes?A monocular microscope only has one ocular lens while a binocular microscope has two ocular lenses.
- 8What is an electron microscope?An electron microscope works on small beams of electrons that magnify the image more than light microscopes do.
- 9Up to how many times can an image be magnified through an electron telescope?Up to a million times magnification.
- 10What are two types of electron microscopes?TEM and SEM
- 11What does TEM stand for?Transmission electron microscope
- 12What does SEM stand for?Scanning electron microscope
- 13Why 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.
- 14What is the maximum magnification for a light microscope?One thousand times
- 15What is the maximum magnification for a stereo microscope?One hundred times
- 16How do you find the total magnification of a microscope?Multiply the ocular lens magnification by the objective lens magnification.
- 17If 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 - 18Name 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. - 19Name 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. - 20Name 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. - 21Name four features of a SEM.1. Electrons reflect off specimen.
2. Black and white but can be coloured using computers.
3. Magnifies view greatly. - 22Define fiend of view?The part of the specimen seen through the microscope.
Informações
- Descrição
- Microscopes and magnification.
- Criado por
- Hibah Albadri
- Visualizações
- 25
- Avaliação