12.
Determine the two general categories of the single lenses below by
labeling beneath each lens with the letter "P" for positive lens or
the letter "N" for negative lens. Note: The light direction is from
left to right.
13.
Light rays will always bend (refract) towards what part of the lens?
______________________________________________________________________
14.
Optical flame can be reduce or eliminated by use of a _______________.
13
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