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NAO Course II questions well answered to pass
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NAO Course II questions well answered to pass
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NAO Course II questions well answeredto pass
Corpuscular theory of light - correct answer ✔✔light consists of tiny particles of corpuscles, emitted by
light source and absorbed by the eye- Newton
Electromagnetic wave theory - correct answer ✔✔light travels in a series of waves moving outward from
light source- James Clark Maxwell
Frequency - correct answer ✔✔the number of wavelengths that pass by a point each second
Beam - correct answer ✔✔group of pencils all pointing on light source
Pencil - correct answer ✔✔group of ray emanating from light source
Visible Light Spectrum Wavelength range - correct answer ✔✔400nm-700nm
dispersion - correct answer ✔✔separation of various colored light
UV-C - correct answer ✔✔200-290nm; absorbed by ozone
UV-B - correct answer ✔✔290-320nm, absorbed by tear film, cornea, conjunctiva, portions of UV-B that
reaches lens can be cause of cataracts
UV-A - correct answer ✔✔320-380nm, transmitted by cornea and partly absorbed by lens, ocular hazard
HEV - correct answer ✔✔High Energy Visible Light; blue light 380-460nm, factor to age related macular
degeneration
,Critical Angle - correct answer ✔✔the angle of incidence that produces an angle of refraction of 90
degrees
How to find Critical angle - correct 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 - correct 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 - correct 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 - correct answer ✔✔waves moving in same direction and crest are at the same
place and time (in phase)- reflection occurs
Index of refraction - correct 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 - correct answer ✔✔the more it bends light and slower the speed
faster the speed of light - correct answer ✔✔less light is bent
Diffraction - correct answer ✔✔when light is bent without enter another medium; light bending around
doorway into dark room
Refraction - correct answer ✔✔bending of light as its passing between 2 different refractive mediums
What is the index of refraction in air - correct answer ✔✔1.0
when light strikes perpendicular angle - correct answer ✔✔it will be slowed down and will travel
through medium on original path
, when light strikes same surface @ an oblique angle - correct answer ✔✔it will slow down, bend and will
emerge slightly deviated from original path
Angle of Incidence - correct answer ✔✔angle @ which a ray strikes surface and a line perpendicular to
the surface of "normal" (i)
Angle of refraction - correct answer ✔✔angle between the ray inside the glass and the line
perpendicular to the surface (r)
Angle of Deviation - correct answer ✔✔angle from which the line would have extended with no
deviation from where it actually extends "d"
Snell's Law - correct 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 - correct answer ✔✔<i=<r + <d
light traveling from one medium to another, direction of travel is perpendicular or normal to interface -
correct answer ✔✔it will change speed but NOT direction
Light travels from a less dense material to a denser material @ and angle to normal - correct answer
✔✔it will bend toward the normal
light travels from denser material to less dense material @ angle to the normal - correct answer ✔✔it
will bend away from the normal
absorbtion - correct answer ✔✔when ray of light enters lens some light will not completely travel
through lens
specular reflection - correct answer ✔✔forming of a clear image when light strikes a surface
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