NAO VOL 4 ANTI-REFLECTIVE LENSES AND
TREATMENTS WORKSHEET COMPLETE
QUESTIONS AND ANSWERS WITH VERIFIED
SOLUTIONS!
Which is a correct statement concerning light waves that are more than 20 feet
from their source? - ANSWER they have a flat wavefront
What is the range of visible wavelengths the human eye is sensitive to? -
ANSWER 380nm to 760nm
Which of the following occurs to the greatest degree when light encounters a lens
surface? - ANSWER transmitted
Lens reflections increase in brightness and intensity as _____ - ANSWER the
refractive index of the lens' material becomes higher
How much light does a 1.74 index lens reflect? - ANSWER 15.7%
On what optical characteristic are AR treatments based upon? - ANSWER
destructive interference
What does the term "broadband" mean in regard to AR treatments? - ANSWER
a reduction of surface reflections over the entire visible spectrum
Which type of glare does AR treatment eliminate? - ANSWER distracting
, Where is ultra-violet found in the electro-magnetic spectrum? - ANSWER
below violet
When light is reflected back towards the wearer it can _____ - ANSWER
compromise vision and reduce visual performance
Who is credited with being the inventor of AR treatment? - ANSWER carl zeiss
company
In order for an AR lens treatment to be effective, its index of refraction must
be_____ of the index of the material it is being coated upon. - ANSWER the
square root
How thick are today's modern AR lens treatments? - ANSWER 0.2 to 0.3
microns
What coating material was used to create early AR lenses? - ANSWER
Magnesium fluoride
Each layer of modern AR treatment is composed of a different material of either
_____ - ANSWER silicone dioxide or a metal oxide
How do modern AR lenses prevent crazing of the AR treatment on plastic lenses? -
ANSWER a special hard coating is used that acts as a transition between the
glass-like AR treatment and the plastic lens
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