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NAO COURSE II BOOK TWO STUDY GUIDE QUESTIONS & ANSWERS GRADED A+
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NAO COURSE II BOOK TWO STUDY GUIDE QUESTIONS & ANSWERS GRADED A+
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NAO COURSE II BOOKTWO STUDY GUIDE
QUESTIONS &
ANSWERS GRADED A+
NAO
Evatee 10/23/24 NAO
,NAO COURSE II BOOK TWO STUDY GUIDE
QUESTIONS & ANSWERS GRADED A+
Corpuscular theory of light Answer - light consists of tiny particles of
corpuscles, emitted by light source and absorbed by the eye- Newton
Electromagnetic wave theory Answer - light travels in a series of waves moving
outward from light source- James Clark Maxwell
Frequency Answer - the number of wavelengths that pass by a point each
second
Beam Answer - group of pencils all pointing on light source
Pencil Answer - group of ray emanating from light source
Visible Light Spectrum Wavelength range Answer - 400nm-700nm
dispersion Answer - separation of various colored light
UV-C Answer - 200-290nm; absorbed by ozone
UV-B Answer - 290-320nm, absorbed by tear film, cornea, conjunctiva,
portions of UV-B that reaches lens can be cause of cataracts
, UV-A Answer - 320-380nm, transmitted by cornea and partly absorbed by lens,
ocular hazard
HEV Answer - High Energy Visible Light; blue light 380-460nm, factor to age
related macular degeneration
Critical Angle Answer - the angle of incidence that produces an angle of
refraction of 90 degrees
How to find Critical angle Answer - Sin(i)= N(2)/N(1) Sine of angle of incidence
equals index of refraction of 2nd medium divided by index of refraction of 1st
medium
Internal Reflection Answer - when light travels from a medium of greater index
to a medium of lesser index, it is refracted away from the normal
destructive wavelength Answer - 2 waves moving in same direction but crest
are opposite or out of phase; they cancel each other out- no reflection (out of
phase)
Constructive wavelength Answer - waves moving in same direction and crest
are at the same place and time (in phase)- reflection occurs
Index of refraction Answer - a measure of the amount a ray of light bends
when it passes from one medium to another
n= (speed of light in air)/(speed of light in medium) where "n" is index of
refraction
higher index of refraction Answer - the more it bends light and slower the
speed
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