Answer: 20 years. Furnaces should last between 15 and 20 years, according to industry experts and the Department of Energy. Furnace filters, however, only hold up one to three months â and in order to avoid an expensive service call, it's crucial to change them on the manufacturer's schedule.
Lens Improvement. Later in the 16th century, Anton van Leeuwenhoek began polishing and grinding lenses when he discovered that certain shaped lenses increased an imageâs size. The glass lenses that he created could enlarge an object many times.
Short Answer: Anton van Leeuwenhoek made innovations to the simple microscope with a single lens. His microscopes received no special name and were enhancements of the simpl â¦ e microscope.. Anton van Leeuwenhoek always referred to his instrument as a Vergroot-glas, which translates into magnifying glass.