Flashcards
Khadija 8B - Science 2.1
Cards in this deck (20)
- 1What is a microscope?An instrument used to magnify small things in order to make them more visible to us.
- 2What is microscopic used to describe?Microscopic is used to describe objects that can only be seen using a microscope.
- 3What is a specimen?The object being looked at through a microscope.
- 4What is an image?An image is what is seen through using the microscope.
- 5What are ocular lenses?The lens of the microscope closest to your eye, also known as the eyepiece.
- 6What is a light microscope?A light microscope is a microscope that uses light to reveal the image.
- 7What is a monocular microscope?A monocular microscope is a type of light microscope which has only one eyepiece or ocular lens.
- 8What is a binocular microscope?A light microscope with two eyepieces or ocular lenses is known as a binocular microscope.
- 9What 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.
- 10What is the objective lens?The lens of the microscope closest to the stage (where the specimen is placed).
- 11What is magnification?The amount by which the image is magnified (made bigger) compared to the real size of the object (specimen).
- 12What is the field of view?The amount of the specimen seen through the microscope. (More magnification means you are seeing less of the specimen).
- 13What is a micrometre?A micrometre is either one-thousandth of a millimetre or one-millionth of a metre.
- 14What is an electron microscope?An electron microscope is a type of microscope that uses beams of electrons to magnify up to a million times.
- 15What are the 2 types of electron microscopes?The 2 types of electron microscopes are:
1. (TEM) transmission electron microscope
2. (SEM) scanning electron microscope - 16What 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 - 17What are two types of lenses found in a light microscope?2 lenses found in a light microscope :
1. Ocular lenses
2. Objective lenses - 18Definition of dissect?To dissect is to cut apart a dead plant or animal to study and observe it.
- 193 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. - 20How is the total magnification of a microscope calculated?Total magnification = ocular lens magnification x objective lens magnification.