Well these days we heard about the spycamera in the trail rooms. And about the 2way mirrors in the toilet room. This is increasing in Changing Rooms of Big Bazaar, Shoppers Stop and such big malls.
A pinhole camera is a simple camera without a lens and with a single small aperture – effectively a light-proof box with a small hole in one side. Light from a scene passes through this single point and projects an inverted image on the opposite side of the box.
