NAO Course II Training Exam Questions And Already Passed Answers.
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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 ...
NAO Course II Training Exam Questions
And Already Passed Answers.
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)
Angle of Deviation - Answer angle from which the line would have extended with no deviation from
where it actually extends "d"
Snell's Law - Answer n(1)Sin(i)=n(2)Sin(r) where n(1)and n(2)= index of refractive medium, (i)= angle of
incidence, (r)= angle of refraction
Snell's Law simplified - Answer <i=<r + <d
light traveling from one medium to another, direction of travel is perpendicular or normal to interface -
Answer it will change speed but NOT direction
Light travels from a less dense material to a denser material @ and angle to normal - Answer it will
bend toward the normal
light travels from denser material to less dense material @ angle to the normal - Answer it will bend
away from the normal
absorbtion - Answer when ray of light enters lens some light will not completely travel through lens
specular reflection - Answer forming of a clear image when light strikes a surface
diffuse reflection - Answer reflection of light from a rough surface, does not produce clear image
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