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NAO Course II Questions + Answers Graded A+
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Diffraction - ️️when light is bent without enter another medium; light bending around doorway into dark room Index of refraction - ️️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 ...

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  • October 24, 2024
  • 12
  • 2024/2025
  • Exam (elaborations)
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NAO Course II
Diffraction - ✔️✔️when light is bent without enter another medium; light bending around
doorway into dark room

Index of refraction - ✔️✔️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 - ✔️✔️the more it bends light and slower the speed

Electromagnetic wave theory - ✔️✔️light travels in a series of waves moving outward
from light source- James Clark Maxwell

Frequency - ✔️✔️the number of wavelengths that pass by a point each second

Beam - ✔️✔️group of pencils all pointing on light source

Pencil - ✔️✔️group of ray emanating from light source

Visible Light Spectrum Wavelength range - ✔️✔️400nm-700nm

dispersion - ✔️✔️separation of various colored light

UV-C - ✔️✔️200-290nm; absorbed by ozone

UV-B - ✔️✔️290-320nm, absorbed by tear film, cornea, conjunctiva, portions of UV-B
that reaches lens can be cause of cataracts

UV-A - ✔️✔️320-380nm, transmitted by cornea and partly absorbed by lens, ocular
hazard

HEV - ✔️✔️High Energy Visible Light; blue light 380-460nm, factor to age related
macular degeneration

Critical Angle - ✔️✔️the angle of incidence that produces an angle of refraction of 90
degrees

Corpuscular theory of light - ✔️✔️light consists of tiny particles of corpuscles, emitted
by light source and absorbed by the eye- Newton

How to find Critical angle - ✔️✔️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 - ✔️✔️when light travels from a medium of greater index to a
medium of lesser index, it is refracted away from the normal

destructive wavelength - ✔️✔️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 - ✔️✔️waves moving in same direction and crest are at the
same place and time (in phase)- reflection occurs

faster the speed of light - ✔️✔️less light is bent

Refraction - ✔️✔️bending of light as its passing between 2 different refractive mediums

What is the index of refraction in air - ✔️✔️1.0

when light strikes perpendicular angle - ✔️✔️it will be slowed down and will travel
through medium on original path

when light strikes same surface @ an oblique angle - ✔️✔️it will slow down, bend and
will emerge slightly deviated from original path

Angle of Incidence - ✔️✔️angle @ which a ray strikes surface and a line perpendicular
to the surface of "normal" (i)

Angle of refraction - ✔️✔️angle between the ray inside the glass and the line
perpendicular to the surface (r)

Angle of Deviation - ✔️✔️angle from which the line would have extended with no
deviation from where it actually extends "d"

Snell's Law - ✔️✔️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 - ✔️✔️<i=<r + <d

light traveling from one medium to another, direction of travel is perpendicular or normal
to interface - ✔️✔️it will change speed but NOT direction

Light travels from a less dense material to a denser material @ and angle to normal -
✔️✔️it will bend toward the normal

light travels from denser material to less dense material @ angle to the normal - ✔️✔️it
will bend away from the normal

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