Optical tweezers in iPad-2

Credit: gla.ac.uk

Researchers of Optics from the Glasgow University and Bristol university have developed an iPad application for accurate, easy and intuitive use of optical tweezers.
Optical tweezers (originally called "single-beam gradient force trap") are scientific instruments that use a highly-focused laser beam to provide an attractive or repulsive force (typically on the order of piconewtons), depending on the refractive index mismatch to physically hold and move microscopic dielectric objects. Optical tweezers have been particularly successful in studying a variety of biological systems in recent years.


Following video will help to understand this: