IITian claims her ₹2 'smartphone microscope' can spot fake notes

Bhuvaneshwari Karunakaran, an IIT Bombay PhD student, has said she has developed a lens for ₹2 that can be used in detection of fake currency notes, sperm counts and blood cell analysis. The lens, made with a silicone polymer with water, works when placed over a smartphone camera and can be used to see objects as small as 1.5 microns.