Who improved the microscope in 1850 so that it magnified x1000?

• A. Antony van Leuwenhoek
• B. Charles Spencer
• C. Joseph Ulster
• D. Robert Hooke

Answer: (C)

Improvements in microscope design in the 19th century allowed higher magnification, around 1000x, by making lenses clearer and less prone to color distortion. The breakthrough came from developing achromatic lenses that corrected chromatic aberration, so the instrument could use higher objective power without the image turning color-fringed and blurred. This added clarity opened up the possibility of much closer examination of tiny structures. In this period the key figure linked to pushing lens quality forward is Joseph Jackson Lister, whose refinements to lenses and alignment reduced distortion and enabled sharper, higher-magnification work. The other famous early microscopists, like Leeuwenhoek and Hooke, are celebrated for discoveries and early microscopes, not for this particular leap to higher magnification through lens design. The name listed in this item is not the one routinely credited with this development; the important idea is the shift to better lenses enabling greater magnification in the 1850s, which laid the groundwork for later, even higher magnifications.