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ABO / NAO 4 QUESTIONS AND ANSWERS WITH VERIFIED SOLUTIONS | LATEST UPDATE 2025
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ABO / NAO 4 QUESTIONS AND ANSWERS WITH VERIFIED SOLUTIONS | LATEST UPDATE 2025
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ABO / NAO 4 QUESTIONS AND ANSWERS WITHVERIFIED SOLUTIONS | LATEST UPDATE 2025
the tools, (lens clocks) laps and gauges(generator calibrations) used in surfacing
lenses are calibrated for what glass of index - ANSWER 1.53
what is the focal length for 10D lens - ANSWER 1 over 10 = .1m
the optical center of a round segment is located ___? - ANSWER at the
geometric center of the segment
in a nearsighted eye incident parallel rays of light form an image where? -
ANSWER anterior to the retina / in front of the retina
what is spherical aberration - ANSWER an optical defect caused by peripheral
and paraxial rays focusing at different points along the optical axis of a lens
in a convergent lens, an object point located at infinity will be focused at which
focal point? - ANSWER the secondary focal point / this is the point where
parallel rays of light are brought into focus
what determines the focal length of a thick lens? - ANSWER curvature of its
refracting surfaces, the thickness of the lens and its index of refraction
what does LTB stand for? - ANSWER length to bend/ temple length measured
from the center of the hinge barrel to the middle of the bend
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