Linear magnification "M" is not always the most useful measure of magnifying power. Thick concave mirrors combined with magnifying lenses projected the acetylene flame light. This value of the magnifying power is the one normally used to characterize magnifiers. Optical microscopes and magnifying devices also present unique safety challenges. It featured a cornered rat seen through a magnifying hand lens. Woods test&colon; This is an ultraviolet light with a magnifying lens. The four observe the crime scene, Holmes using a magnifying lens and tape measure. Some optical instruments provide visual aid by magnifying small or distant subjects. Viewers examined details using a magnifying glass. Until then he may have used a monocle or pocket magnifying glass when necessary. The treatment is generally Aristotelian and limited by use of a simple magnifying lens. This is exactly what the eye does when looking through a magnifying glass. The Justices examined the items closely with a magnifying glass. The costume's goggles have infrared and magnifying capabilities. She enjoyed reading, even with the help of a magnifying glass.