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NAO Vol 4 Test Questions and Answers-Anti-reflective lenses and treatments worksheet
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NAO Vol 4 Test Questions and Answers-Anti-reflective lenses and treatments worksheet
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NAO Vol 4 Anti-reflective lenses andtreatments worksheet
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
Which of the following methods are used to place a hard coating on a plastic lens? - Answer-spinning,
dipping
How thick is the hard coating used on plastic lenses? - Answer-3 to 5 microns
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