Electron microscopes have certain advantages over optical microscopes: The biggest advantage is that they have a higher resolution and are therefore also able of a higher magnification (up to 2 million times). Light microscopes can show a useful magnification only up to 1000-2000 times. This is a physical limit imposed by the wavelength of the light. Electron microscopes therefore allow for the visualization of structures that would normally be not visible by optical microscopy.
berm (plural berms) A narrow ledge or shelf, as along the top or bottom of a slope. A raised bank or path, especially the bank of a canal opposite the towpath. A terrace formed by wave action along a beach. A mound or bank of earth, used especially as a barrier or to provide insulation.
1 Properly constructed backstop berm Deinition: A backstop is a device constructed to stop or re-direct bullets ired on a range. Purpose/Use: A backstop is the key component providing range safety and use for people in the area in and beyond a rile or pistol range. berm is an earthen or concrete embankment or wall constructed to restrict bullet travel to a. Purpose: Walling off and isolating various distanced shooting bays at an outdoor range, so that concurrent. use of each range can take place, with independent activity at each range and iring line.