Microscopy

Resolution is the ability of an optical instrument to..

Label the light microscope.

Select the statement which correctly describes the relationship between magnification, image size, and actual size.

[blank_start]Laser scanning[blank_end] microscopes work by scanning an object with very high resolution using a laser beam, which is analysed by a computer to form an [blank_start]image[blank_end]. While expensive, these microscopes produce high r[blank_start]esolution[blank_end], high c[blank_start]ontrast[blank_end] images that can also be [blank_start]3[blank_end]-dimensional.

[blank_start]Electron[blank_end] microscopes emit a wavelength of radiation of about [blank_start]0.004[blank_end] nanometers, resulting in a very high [blank_start]resolution[blank_end]. They are also able to [blank_start]magnify[blank_end] images much more than other types of microscope. During the process, [blank_start]electrons[blank_end] are 'spat out' by a [blank_start]cathode[blank_end]. Instead of a glass lens to focus the image in other types of microscope, the [blank_start]electron[blank_end] microscope uses a [blank_start]magnet[blank_end]. When the electrons reach the sample, some pass [blank_start]through[blank_end] it and some bounce off, depending on whether the microscope is [blank_start]scanning[blank_end] (SEM) or [blank_start]transmission[blank_end] (TEM).

What type of microscope was used to take this picture?

What type of microscope was used to take this image?

Which of the following are techniques for preparing a sample for microscopy? Check all that apply.

A microscope of magnification x4000 takes a picture of a cell. In the image, the cell is 2cm wide. What is the actual width of the cell?