What is a primary angle?

Answer Glaucoma, a leading cause of blindness, can be treated successfully if caught early on. According to, it affects approximately 2% of people over the age of 40. Primary Angl... Read More »

Top Q&A For: What is a primary angle

How does height affect angle ie a 90 degree roof angle at a 20 degree pitch with a building That projects 10 degrees what angle does the building meet the roof?

What is the difference between "28mm wide-angle" and "24mm ultra wide-angle lens"?

If you own a Sony, Pentax or Nikon DSLR the 24mm lens will have the equivalent angle of view of a 36mm lens on a full-frame DSLR while the 28mm lens will have the equivalent angle of view of a 42mm... Read More »

How to Find the Length of the Angle Bisector With 2 Sides and One Angle?

figureThis has been by K.Jayaganesh all alone.This is the Jayaganesh Theorem.This can be used to find the length of the angle bisector by the 2 sides not intersected by the angle and the angle invo... Read More »

What is the difference betwen a Wide-angle lens converter and just a wide-angle lens?

A wide angle lens replaces (temporarily) your standard lens, while a wide angle lens converter screws onto the front of your existing lens (it requires that you get the right one based on the filte... Read More »