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2. This Is The Best Way To Hang Pictures, According To An ... - AOL

   www.aol.com/best-way-hang-pictures-according...

   Once your paper templates are in place, place a level on top of them to make sure each "frame" is completely straight. Then measure how far down the hanging hardware is from the top of the frame.

3. Straightedge - Wikipedia

   en.wikipedia.org/wiki/Straightedge

   A straightedge or straight edge is a tool used for drawing straight lines, or checking their straightness. If it has equally spaced markings along its length, it is usually called a ruler . Straightedges are used in the automotive service and machining industry to check the flatness of machined mating surfaces.

4. Rectilinear lens - Wikipedia

   en.wikipedia.org/wiki/Rectilinear_lens

   In photography, a rectilinear lens is a photographic lens that yields images where straight features, such as the edges of walls of buildings, appear with straight lines, as opposed to being curved. In other words, it is a lens with little or no barrel or pincushion distortion. At particularly wide angles, however, the rectilinear perspective ...

5. Line laser - Wikipedia

   en.wikipedia.org/wiki/Line_laser

   Line laser with interchangeable lenses. A line laser is a device that employs a laser and an optical lens to project the laser beam as a line rather than a point (e.g. laser pointer). This may be achieved by passing the beam through a cylindrical lens or a Powell lens. [1]

6. How to hang a frame with toothpaste - AOL

   www.aol.com/lifestyle/2014-11-13-how-to-hang-a...

   When it comes to hanging a frame, you've only got one chance to get it right. Lucky for you, there's a surprisingly simple way to help with this nerve-racking task. Check out the video above to ...

7. Optical tweezers - Wikipedia

   en.wikipedia.org/wiki/Optical_tweezers

   But an unfocused laser still causes a force pointing away from the laser. Ray optics explanation (focused laser). In addition to keeping the bead in the center of the laser, a focused laser also keeps the bead in a fixed axial position: The momentum change of the focused rays causes a force towards the laser focus, both when the bead is in ...