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www.reference.com/article/quizlet-cards-6f0889046cdb01b2

Quizlet cards are virtual flash cards created by the users of Quizlet.com. Teachers use Quizlet to provide online study resources for their students. Learners locate relevant study cards to assist in studying particular subjects. To access Quizlet, users must first regi...

www.reference.com/article/services-quizlet-b930bd6e07539986

Quizlet allows users to create and browse over 40 million previously created study sets and quizzes. Study sets contain flash cards, quizzes, audio training and games designed to help individuals study various topics. Quizlet is also available as an app on iPhone and An...

www.reference.com/article/use-quizlet-flash-cards-eaf4c5dc42c4892b

As of 2015, signing up for Quizlet flashcards is free, although users have the option to add superpowers to their accounts for a modest charge. Once logged in, users create study sets, record voices or study from existing sets. Creating a class group makes group study p...

www.reference.com/article/things-can-quizlet-app-5ec8d8e1fa8c7af3

The Quizlet app is a mobile version of Quizlet.com, so the app provides the study tools, flash cards, and games that are found on the website. All content on the site and app is user generated.

www.reference.com/article/can-quizlet-practice-tests-taken-bc235ed3d739759

Quizlet practice tests on many different subjects are available at Quizlet.com. To take these tests, users must first sign up at the website using Facebook, Google or their email address. Quizlet is available on home or school computers as well as through iOS and Androi...

www.reference.com/article/parfocal-lens-576cf066506b22fb

A parfocal lens is a zoom lens that holds its focus throughout its entire zoom range. A varifocal lens, on the other hand, is a zoom lens that requires the lens to be refocused if the focal length is changed.

www.reference.com/article/mean-microscope-parfocal-d49f701201ffe9d2

Parfocal microscopes maintain focus throughout real-time magnification changes. These microscopes also remain focused when the user rotates objectives. This capability is a function of the lens and is a particularly popular feature on field microscopes. Parfocal lenses ...