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NAO - The National Academy of Opticianry (Book 2): Questions & Answers
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NAO - The National Academy of Opticianry (Book 2): Questions & Answers
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NAO - The National Academy of Opticianry (Book 2):Questions & Answers
The visible spectrum is only a small portion of the electromagnetic spectrum
and consists of wavelengths from __________ to ___________. Right Ans - 380
nm to 750 nm
Which category of invisible light is the major cause of skin and ocular damage?
Right Ans - UV-A
Which color has the longest wavelength? Right Ans - Red
How is the wavelength of light measured? Right Ans - Crest to crest OR
Trough to Trough
Who introduced the electro-magnetic wave theory? Right Ans - Maxwell
Why do we see a banana as yellow? Right Ans - Because the CONES in our
eyes receive the light waves. The eyes see the REFLECTION of color.
What does HEV stand for? Right Ans - High Energy Visible
Why is the sky blue? Right Ans - Because the blue wavelength scatters the
most
Absorption Right Ans - When a ray of light enters a lens, some of the light
will not completely travel through the lenses
Deviation Right Ans - Angle a ray of light is changed from its original path.
Diffuse Reflection Right Ans - A reflection from a rough surface- the
reflection does not produce a clear image.
Incidence Right Ans - The angle which a ray of light makes with the surface
of a refracting medium.
Reflection Right Ans - The return of light when going from one medium
into another.
,Refraction Right Ans - -The bending of light when going from one medium
into another.
-The angle created when a ray of light passes from one medium into another.
Speculation Reflection Right Ans - The forming of a clear image when light
strikes a surface.
Why is the pencil red? Right Ans - It reflects red rays back toward the eye
and absorbs all other rays of visible light.
Why is the blacktop black? Right Ans - It does not reflect any rays back
toward your eye; rather it absorbs them all
The 2 theories of light that we primarily discuss are the _________ & _________.
Right Ans - Corpuscular & Electromagnetic Wave
Which light theory explains shadows? Right Ans - Corpuscular Theory
Which theory explains rainbows? Right Ans - Electromagnetic Wave
Theory
What is the size of a nanometer? Right Ans - 1 billionth of a meter
What is the speed of light in air? Right Ans - 186,000 miles per second
A single band of light from a single point on light source is called a __________.
Right Ans - Ray
If a light beam passes through a green sunglass lens, why will exiting light be
green? Right Ans - The green rays are refracted through the lens and all
other color rays are absorbed by the pigments in the lens material.
When a ray of light travels from air into water, what happens to the ray of
light? Right Ans - -When it is perpendicular to the surface, it slows down
but does not change direction. It is not deviated or displaced.
-When it is not perpendicular to the surface, it slows down and changes
direction toward the normal. It deviates from its original path.
, What does critical angle mean? Right Ans - A light ray leaving a denser
material for a rarer material that is at an angle to the normal that results in it
traveling parallel to the surface of the material. If the angle of incidence is
greater than the critical angle the ray will reflect inside the material and will
not exit into the rarer material.
If a light ray travels from air to water with an angle of incidence of 15 degrees
and an angle of refraction of 11 degrees, how much did it deviate? Right
Ans - I=r+d
15=11+d
D=15-11
D=4
If a ray of light leaves the water traveling into air with an angle of incidence of
20 degrees and it is deviated by -7 degrees, what was the angle of refraction?
Right Ans - I=r+d
20=r+(-7)
20=r-7
20+7=r
27=r
If a ray of light travels from one material to another an angle of incidence of
32 and an angle of refraction of 26, what is the angle of deviation? Is the ray
traveling into or exiting the lens? Right Ans - I=r+d
32=26+d
6=d
The ray is entering the lens.
A ray of light crosses an interface and is deviated from its path by 5 degrees. If
the angle of refraction is 20 degrees, what is the angle of incidence? Right
Ans - I=r+d
I=20+5
I=25
The ray is again entering the lens material.
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