NAO BOOK 2 UPDATED EXAM Questions And
CORRECT Answers
The 2 theories of light that we primarily discuss are the _________ & _________. - CORRECT
ANSWERS Corpuscular & Electromagnetic Wave
Which light theory explains shadows? - CORRECT ANSWERS Corpuscular Theory
Which theory explains rainbows? - CORRECT ANSWERS Electromagnetic Wave Theory
What is the size of a nanometer? - CORRECT ANSWERS 1 billionth of a meter
What is the speed of light in air? - CORRECT ANSWERS 186,000 miles per second
A single band of light from a single point on light source is called a __________. - CORRECT
ANSWERS Ray
The visible spectrum is only a small portion of the electromagnetic spectrum and consists of
wavelengths from __________ to ___________. - CORRECT ANSWERS 380 nm to 750 nm
Which category of invisible light is the major cause of skin and ocular damage? - CORRECT
ANSWERS UV-A
Which color has the longest wavelength? - CORRECT ANSWERS Red
How is the wavelength of light measured? - CORRECT ANSWERS Crest to crest OR Trough
to Trough
,Who introduced the electro-magnetic wave theory? - CORRECT ANSWERS Maxwell
Why do we see a banana as yellow? - CORRECT ANSWERS Because the CONES in our eyes
receive the light waves. The eyes see the REFLECTION of color.
What does HEV stand for? - CORRECT ANSWERS High Energy Visible
Why is the sky blue? - CORRECT ANSWERS Because the blue wavelength scatters the most
Absorption - CORRECT ANSWERS When a ray of light enters a lens, some of the light will
not completely travel through the lenses
Deviation - CORRECT ANSWERS Angle a ray of light is changed from its original path.
Diffuse Reflection - CORRECT ANSWERS A reflection from a rough surface- the reflection
does not produce a clear image.
Incidence - CORRECT ANSWERS The angle which a ray of light makes with the surface of a
refracting medium.
Reflection - CORRECT ANSWERS The return of light when going from one medium into
another.
Refraction - CORRECT ANSWERS -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 - CORRECT ANSWERS The forming of a clear image when light
strikes a surface.
Why is the pencil red? - CORRECT ANSWERS It reflects red rays back toward the eye and
absorbs all other rays of visible light.
Why is the blacktop black? - CORRECT ANSWERS It does not reflect any rays back toward
your eye; rather it absorbs them all
If a light beam passes through a green sunglass lens, why will exiting light be green? - CORRECT
ANSWERS 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? - CORRECT
ANSWERS -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? - CORRECT ANSWERS 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? - CORRECT ANSWERS I=r+d
15=11+d
D=15-11
CORRECT Answers
The 2 theories of light that we primarily discuss are the _________ & _________. - CORRECT
ANSWERS Corpuscular & Electromagnetic Wave
Which light theory explains shadows? - CORRECT ANSWERS Corpuscular Theory
Which theory explains rainbows? - CORRECT ANSWERS Electromagnetic Wave Theory
What is the size of a nanometer? - CORRECT ANSWERS 1 billionth of a meter
What is the speed of light in air? - CORRECT ANSWERS 186,000 miles per second
A single band of light from a single point on light source is called a __________. - CORRECT
ANSWERS Ray
The visible spectrum is only a small portion of the electromagnetic spectrum and consists of
wavelengths from __________ to ___________. - CORRECT ANSWERS 380 nm to 750 nm
Which category of invisible light is the major cause of skin and ocular damage? - CORRECT
ANSWERS UV-A
Which color has the longest wavelength? - CORRECT ANSWERS Red
How is the wavelength of light measured? - CORRECT ANSWERS Crest to crest OR Trough
to Trough
,Who introduced the electro-magnetic wave theory? - CORRECT ANSWERS Maxwell
Why do we see a banana as yellow? - CORRECT ANSWERS Because the CONES in our eyes
receive the light waves. The eyes see the REFLECTION of color.
What does HEV stand for? - CORRECT ANSWERS High Energy Visible
Why is the sky blue? - CORRECT ANSWERS Because the blue wavelength scatters the most
Absorption - CORRECT ANSWERS When a ray of light enters a lens, some of the light will
not completely travel through the lenses
Deviation - CORRECT ANSWERS Angle a ray of light is changed from its original path.
Diffuse Reflection - CORRECT ANSWERS A reflection from a rough surface- the reflection
does not produce a clear image.
Incidence - CORRECT ANSWERS The angle which a ray of light makes with the surface of a
refracting medium.
Reflection - CORRECT ANSWERS The return of light when going from one medium into
another.
Refraction - CORRECT ANSWERS -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 - CORRECT ANSWERS The forming of a clear image when light
strikes a surface.
Why is the pencil red? - CORRECT ANSWERS It reflects red rays back toward the eye and
absorbs all other rays of visible light.
Why is the blacktop black? - CORRECT ANSWERS It does not reflect any rays back toward
your eye; rather it absorbs them all
If a light beam passes through a green sunglass lens, why will exiting light be green? - CORRECT
ANSWERS 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? - CORRECT
ANSWERS -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? - CORRECT ANSWERS 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? - CORRECT ANSWERS I=r+d
15=11+d
D=15-11
