NAO Volume 2 Exam Solved 100%
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
What does the term critical angle of a material mean? - Answer- ray of light is striking
the surface at an angle so that the ray is refracted along the surface of the lens
A minus lens with the optical center moved up creates? - Answer- base down prism
A base-up prism - Answer- bends light toward the base, bends light rays away from the
apex, projects an image of the objects downward
the wavelengths of visible light range approximately from? - Answer- 400-720
nanmometer
the wavelengths of light that are the most pleasing to the eye are? - Answer- blue-green
The breakdown of light into its component colors is called? - Answer- dispersion
The point on a lens which a ray of light will pass through without being deviated is
called? - Answer- optical center
The lower the abbe number the... - Answer- more the chromatic aberration
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
What does the term critical angle of a material mean? - Answer- ray of light is striking
the surface at an angle so that the ray is refracted along the surface of the lens
A minus lens with the optical center moved up creates? - Answer- base down prism
A base-up prism - Answer- bends light toward the base, bends light rays away from the
apex, projects an image of the objects downward
the wavelengths of visible light range approximately from? - Answer- 400-720
nanmometer
the wavelengths of light that are the most pleasing to the eye are? - Answer- blue-green
The breakdown of light into its component colors is called? - Answer- dispersion
The point on a lens which a ray of light will pass through without being deviated is
called? - Answer- optical center
The lower the abbe number the... - Answer- more the chromatic aberration
