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Describe the characteristics of a molecule of ammonia (NH). The Lewis structure and table of electronegativities are given.
H-N-H
H
the molecular shape is
The bond polarities are non polar/polar
and the molecule shape is
Bent linear tetrahedral/ tetrahedral/ trigonal planar/ pyramidal, and the molecule is polar/nonpolar

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