Unit
Notes - 3
2. Principle
of transmission electron microscope
A beam of
electrons passes through specimen and is focused
onto a fluorescent screen or photographic paper
3. Principle of scanning electron microscope
A beam of
electrons is focused on the surface of the object and
the reflected electrons are focused onto photographic paper or cathode ray tube
4. Why is your red T-shirt red?
It is red
because all colors except red have been absorbed by
the cloth and only red is reflected
5. The unit of measurement for
wavelengths of light is:
Nanometers
(nm)