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NAO Course II - Book Two Study Guide: Questions & Solutions
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NAO Course II - Book Two Study Guide: Questions & Solutions
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NAO Course II - Book Two Study Guide: Questions &Solutions
Corpuscular theory of light Right Ans - light consists of tiny particles of
corpuscles, emitted by light source and absorbed by the eye- Newton
Electromagnetic wave theory Right Ans - light travels in a series of waves
moving outward from light source- James Clark Maxwell
Frequency Right Ans - the number of wavelengths that pass by a point each
second
Beam Right Ans - group of pencils all pointing on light source
Pencil Right Ans - group of ray emanating from light source
Visible Light Spectrum Wavelength range Right Ans - 400nm-700nm
dispersion Right Ans - separation of various colored light
UV-C Right Ans - 200-290nm; absorbed by ozone
UV-B Right Ans - 290-320nm, absorbed by tear film, cornea, conjunctiva,
portions of UV-B that reaches lens can be cause of cataracts
UV-A Right Ans - 320-380nm, transmitted by cornea and partly absorbed
by lens, ocular hazard
HEV Right Ans - High Energy Visible Light; blue light 380-460nm, factor to
age related macular degeneration
Critical Angle Right Ans - the angle of incidence that produces an angle of
refraction of 90 degrees
How to find Critical angle Right Ans - 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 Right Ans - when light travels from a medium of greater
index to a medium of lesser index, it is refracted away from the normal
destructive wavelength Right Ans - 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 Right Ans - waves moving in same direction and
crest are at the same place and time (in phase)- reflection occurs
Index of refraction Right Ans - 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 Right Ans - the more it bends light and slower
the speed
faster the speed of light Right Ans - less light is bent
Diffraction Right Ans - when light is bent without enter another medium;
light bending around doorway into dark room
Refraction Right Ans - bending of light as its passing between 2 different
refractive mediums
What is the index of refraction in air Right Ans - 1.0
when light strikes perpendicular angle Right Ans - it will be slowed down
and will travel through medium on original path
when light strikes same surface @ an oblique angle Right Ans - it will slow
down, bend and will emerge slightly deviated from original path
Angle of Incidence Right Ans - angle @ which a ray strikes surface and a
line perpendicular to the surface of "normal" (i)
Angle of refraction Right Ans - angle between the ray inside the glass and
the line perpendicular to the surface (r)
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