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NAO Course II book two study guide Questions And Answers With Verified Solutions
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NAO Course II book two study guide Questions And Answers With Verified Solutions
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NAO Course II book two study guide QuestionsAnd Answers With Verified Solutions
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
faster the speed of light - ANSWER less light is bent
Diffraction - ANSWER when light is bent without enter another medium; light
bending around doorway into dark room
Refraction - ANSWER bending of light as its passing between 2 different
refractive mediums
What is the index of refraction in air - ANSWER 1.0
when light strikes perpendicular angle - ANSWER it will be slowed down and
will travel through medium on original path
when light strikes same surface @ an oblique angle - ANSWER it will slow
down, bend and will emerge slightly deviated from original path
Angle of Incidence - ANSWER angle @ which a ray strikes surface and a line
perpendicular to the surface of "normal" (i)
Angle of refraction - ANSWER angle between the ray inside the glass and the
line perpendicular to the surface (r)
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