NAO Volume 2 Comprehensive Exam
Questions With All Solved Solutions.
Absorption - Answer in terms of light and lens- when a ray of light enters a lens some of the light will
not completely travel through the lens
Deviation (Angle of) - Answer the angle a ray of light is changed from its original path
Diffuse Relection - Answer a reflection from a rough surface- the reflection does not produce a clear
image
Incidence (Angle of) - Answer the angle which a ray of light makes the surface of a refracting medium
Reflection - Answer the return of light waves from a surface the production of an image
Refraction - Answer the bending of light when going from one medium into another
Refraction (Angle of) - Answer the angle created when a ray of light passes from one medium into
another
Specular Reflection - Answer the forming of a clear image when light strikes a surface
Why is a red pencil red? - Answer It reflects red rays back toward the eye and absorbs all the other rays
of visible light
Why is the blacktop black? - Answer It does not reflect any rays back toward your eye; rather it absorbs
them all
If a light beam passes through a green sunglasses lens, why will the exciting light be green? - Answer
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 (which is denser than air) what happens to the ray of light
if the ray is perpendicular to the surface? - Answer If the ray is perpendicular to the surface it slows
down but does not change direction; it is not deviated or displaced
When a ray of light travels from air into water (which is denser than air) what happens to the ray of light
if the ray is not perpendicular to the surface? - Answer If the ray is not perpendicular to the surface it
slows down and changes direction toward the normal; it is deviated from its original path
When a ray of light travels from water into air ( which is rarer than water) what happens to the ray of
light if the ray is perpendicular to the surface? - Answer If the ray is perpendicular to the surface it
speeds up but does not change direction; it is not deviated or displaced
hen a ray of light travels from water into air ( which is rarer than water) what happens to the ray of light
if the ray of light is not perpendicular to the surface? - Answer If the ray is not perpendicular to the
surface it speeds up and changes direction away from the normal; it is deviated from its original path
What does critical angle mean? - Answer a light ray leaving a denser material is rarer material that is at
an angle of 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
What are the three things that can happen to a ray of light when it passes through a lens? - Answer
absorbed, reflected, refracted
What is the difference between a high index lens and a aspheric lens - Answer high index refers to the
material of the lens; aspheric refers to the surface design of the lens
What is transposition? - Answer is the changing of a precription from plus cylinder to minus cylinder or
the other way around
What type of image is formed by a minus lens? - Answer virtual
A plus lens does what to a light ray that passes through it? - Answer makes them converge
Questions With All Solved Solutions.
Absorption - Answer in terms of light and lens- when a ray of light enters a lens some of the light will
not completely travel through the lens
Deviation (Angle of) - Answer the angle a ray of light is changed from its original path
Diffuse Relection - Answer a reflection from a rough surface- the reflection does not produce a clear
image
Incidence (Angle of) - Answer the angle which a ray of light makes the surface of a refracting medium
Reflection - Answer the return of light waves from a surface the production of an image
Refraction - Answer the bending of light when going from one medium into another
Refraction (Angle of) - Answer the angle created when a ray of light passes from one medium into
another
Specular Reflection - Answer the forming of a clear image when light strikes a surface
Why is a red pencil red? - Answer It reflects red rays back toward the eye and absorbs all the other rays
of visible light
Why is the blacktop black? - Answer It does not reflect any rays back toward your eye; rather it absorbs
them all
If a light beam passes through a green sunglasses lens, why will the exciting light be green? - Answer
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 (which is denser than air) what happens to the ray of light
if the ray is perpendicular to the surface? - Answer If the ray is perpendicular to the surface it slows
down but does not change direction; it is not deviated or displaced
When a ray of light travels from air into water (which is denser than air) what happens to the ray of light
if the ray is not perpendicular to the surface? - Answer If the ray is not perpendicular to the surface it
slows down and changes direction toward the normal; it is deviated from its original path
When a ray of light travels from water into air ( which is rarer than water) what happens to the ray of
light if the ray is perpendicular to the surface? - Answer If the ray is perpendicular to the surface it
speeds up but does not change direction; it is not deviated or displaced
hen a ray of light travels from water into air ( which is rarer than water) what happens to the ray of light
if the ray of light is not perpendicular to the surface? - Answer If the ray is not perpendicular to the
surface it speeds up and changes direction away from the normal; it is deviated from its original path
What does critical angle mean? - Answer a light ray leaving a denser material is rarer material that is at
an angle of 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
What are the three things that can happen to a ray of light when it passes through a lens? - Answer
absorbed, reflected, refracted
What is the difference between a high index lens and a aspheric lens - Answer high index refers to the
material of the lens; aspheric refers to the surface design of the lens
What is transposition? - Answer is the changing of a precription from plus cylinder to minus cylinder or
the other way around
What type of image is formed by a minus lens? - Answer virtual
A plus lens does what to a light ray that passes through it? - Answer makes them converge
