Refracting telescopes use two converging lenses, while reflecting telescopes have one concave mirror and one converging lens. The transverse vibrations of the wave are all in a single plane. Interference and diffraction can be computed exactly and depend on the wavelength. The limitations of a microscope or a telescope are due to diffraction. Interference can also occur when we have two close-by surfaces.
Diffraction grating has many close-by slits, which magnifies the interference effects.
The resolving power of a telescope is limited by diffraction and the larger the objective lens, the better is the resolution. All other charges are multiples of this basic unit of charge. Electric field is a vector, i.e. it has both magnitude and direction. The unit is volt . One volt is one joule per coulomb.