https://www.edmundoptics.com/resources/application-notes/microscopy/understanding-microscopes-and-objectives/

Learn about the different components used to build a microscope, key ... With a simple magnifier, the object is placed within the focal length of the single lens. ..... and generally have a high numerical aperture (NA) and long working distance.

https://www.thorlabs.com/newgrouppage9.cfm?objectgroup_id=9922

The long working distance provides a wide spac. ... Microscopy Objectives, Dry ... Designed for a tube lens focal length of 200 mm, these objectives are ideal for ...

https://sciencing.com/focal-length-microscope-objectives-8596901.html

Apr 25, 2017 ... The focal length of a microscope objective lens is related to its ... Microscope objectives are made of special optical glass that is of higher ...

https://www.newport.com/f/long-working-distance-objectives

long working distance 10x microscope objectives lens model mlwd-10x shown with ruler .... Effective Focal Length, 100 mm, 40 mm. Working Distance, 34 mm ...

https://www.microscopyu.com/microscopy-basics/infinity-optical-systems

This distance is referred to as the mechanical tube length of the microscope. .... Longer objective focal lengths utilized in infinity optical systems require ...

https://www.keyence.com/products/microscope/digital-microscope/vh_lens/models/vh-z50t/index.jsp

VH-Z50T, Long-focal-distance, high-performance zoom lens (50 x to 500 x) in VH lens ... View Catalog VH lens Series Lenses (for Digital Microscope) Catalog.

https://phys.libretexts.org/Bookshelves/University_Physics/Book%3A_University_Physics_(OpenStax)/Map%3A_University_Physics_III_-_Optics_and_Modern_Physics_(OpenStax)/2%3A_Geometric_Optics_and_Image_Formation/2.8%3A_Microscopes_and_Telescopes

The eyepiece, also referred to as the ocular, is a convex lens of longer focal length. The purpose of a microscope is to create magnified images of small objects, ...

https://courses.lumenlearning.com/physics/chapter/26-4-microscopes/

In standard microscopes, the objectives are mounted such that when you ... The object is slightly farther away from the objective lens than its focal length fo, ...

http://zeiss-campus.magnet.fsu.edu/mobile/tutorials/basics/objectivemagnification/indexmobile.html

This tutorial explores how changes in tube lens and objective focal length affect the magnification power of the objective in infinity-corrected microscopes.

http://www.cyto.purdue.edu/cdroms/micro1/7_spon/nikon/id87.htm

It is generally thought that a longer focal length for the tube lens will ... in an infinity optics microscope is obtained using the formula: mo = tube lens focal length ...