14. Which of the following patterns shows infinite sequence?
A) 6, 12, 18, 24, 30
C) First 20 whole numbers
B) English Alphabets
D) 100, 50, 25, 12.5

Apinhole camera is made out of a light-tight box with a piece of film attached to one side and pinhole on the opposite side. the optimum diameter d(in millimeters) of the pinhole can be modeled by d=1.9[ (5.5 x 10^-4) l) ] ^1/2, where l is the length of the camera box (in millimeters). what is the optimum diameter for a pinhole camera if the camera box has a length of 10 centimeters