This syndrome, known as sudden sniffing death, can result from a single session of inhalant use by an otherwise healthy young person. Sudden sniffing death is associated particularly with the abuse of butane, propane, and chemicals in aerosols. Inhalant abuse also can cause death byâ. asphyxiation â from repeated inhalations that lead to high concentrations of inhaled fumes, which displace available oxygen in the lungs;
The biggest difference is that a reflecting telescope uses a mirror to collect and focus the light and a refracting telescope uses lenses for the same purpose. A reflecting â¦ telescope has a concave mirror at the bottom end that reflects the image up to the eyepiece.
Optical Telescopes. In optical astronomy there are three basic types of telescopes; the refractor, the catadioptric and the reflector. The refractor telescope receives light through the objective lens (the large lens closest to the subject being viewed) and sends it to the eyepiece for magnification.