NAO Volume 2 2025-2026 update Q&A verified
Absorption - ✔✔ANS in terms of light and lens- when a ray of light enters a lens some of the light will no
completely travel through the lens
Deviation (Angle of) - ✔✔ANS the angle a ray of light is changed from its original path
Diffuse Relection - ✔✔ANS a reflection from a rough surface- the reflection does not produce a clear imag
Incidence (Angle of) - ✔✔ANS the angle which a ray of light makes the surface of a refracting medium
Reflection - ✔✔ANS the return of light waves from a surface the production of an image
Refraction - ✔✔ANS the bending of light when going from one medium into another
Refraction (Angle of) - ✔✔ANS the angle created when a ray of light passes from one medium into anothe
Specular Reflection - ✔✔ANS the forming of a clear image when light strikes a surface
Why is a red pencil red? - ✔✔ANS It reflects red rays back toward the eye and absorbs all the other ray
of visible light
Why is the blacktop black? - ✔✔ANS It does not reflect any rays back toward your eye; rather it absorb
them all
If a light beam passes through a green sunglasses lens, why will the exciting light be green? - ✔✔AN
The green rays are refracted through the lens and all other color rays are absorbed by the pigments i
the lens material
, When a ray of light travels from air into water (which is denser than air) what happens to the ray of ligh
if the ray is perpendicular to the surface? - ✔✔ANS If the ray is perpendicular to the surface it slows dow
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 ligh
if the ray is not perpendicular to the surface? - ✔✔ANS If the ray is not perpendicular to the surface
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 ligh
if the ray is perpendicular to the surface? - ✔✔ANS If the ray is perpendicular to the surface it speeds u
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
the ray of light is not perpendicular to the surface? - ✔✔ANS If the ray is not perpendicular to the surfac
it speeds up and changes direction away from the normal; it is deviated from its original path
What does critical angle mean? - ✔✔ANS a light ray leaving a denser material is rarer material that is a
an angle of normal that results in it traveling parallel to the surface of the material. If the angle of incidenc
is greater than the critical angle the ray will reflect inside the material and will not exit into the rare
material
What are the three things that can happen to a ray of light when it passes through a lens? - ✔✔AN
absorbed, reflected, refracted
What is the difference between a high index lens and a aspheric lens - ✔✔ANS high index refers to th
material of the lens; aspheric refers to the surface design of the lens
What is transposition? - ✔✔ANS is the changing of a precription from plus cylinder to minus cylinder o
the other way around
What type of image is formed by a minus lens? - ✔✔ANS virtual
A plus lens does what to a light ray that passes through it? - ✔✔ANS makes them converge
What does the term critical angle of a material mean? - ✔✔ANS ray of light is striking the surface at a
angle so that the ray is refracted along the surface of the lens
A minus lens with the optical center moved up creates? - ✔✔ANS base down prism
Absorption - ✔✔ANS in terms of light and lens- when a ray of light enters a lens some of the light will no
completely travel through the lens
Deviation (Angle of) - ✔✔ANS the angle a ray of light is changed from its original path
Diffuse Relection - ✔✔ANS a reflection from a rough surface- the reflection does not produce a clear imag
Incidence (Angle of) - ✔✔ANS the angle which a ray of light makes the surface of a refracting medium
Reflection - ✔✔ANS the return of light waves from a surface the production of an image
Refraction - ✔✔ANS the bending of light when going from one medium into another
Refraction (Angle of) - ✔✔ANS the angle created when a ray of light passes from one medium into anothe
Specular Reflection - ✔✔ANS the forming of a clear image when light strikes a surface
Why is a red pencil red? - ✔✔ANS It reflects red rays back toward the eye and absorbs all the other ray
of visible light
Why is the blacktop black? - ✔✔ANS It does not reflect any rays back toward your eye; rather it absorb
them all
If a light beam passes through a green sunglasses lens, why will the exciting light be green? - ✔✔AN
The green rays are refracted through the lens and all other color rays are absorbed by the pigments i
the lens material
, When a ray of light travels from air into water (which is denser than air) what happens to the ray of ligh
if the ray is perpendicular to the surface? - ✔✔ANS If the ray is perpendicular to the surface it slows dow
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 ligh
if the ray is not perpendicular to the surface? - ✔✔ANS If the ray is not perpendicular to the surface
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 ligh
if the ray is perpendicular to the surface? - ✔✔ANS If the ray is perpendicular to the surface it speeds u
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
the ray of light is not perpendicular to the surface? - ✔✔ANS If the ray is not perpendicular to the surfac
it speeds up and changes direction away from the normal; it is deviated from its original path
What does critical angle mean? - ✔✔ANS a light ray leaving a denser material is rarer material that is a
an angle of normal that results in it traveling parallel to the surface of the material. If the angle of incidenc
is greater than the critical angle the ray will reflect inside the material and will not exit into the rare
material
What are the three things that can happen to a ray of light when it passes through a lens? - ✔✔AN
absorbed, reflected, refracted
What is the difference between a high index lens and a aspheric lens - ✔✔ANS high index refers to th
material of the lens; aspheric refers to the surface design of the lens
What is transposition? - ✔✔ANS is the changing of a precription from plus cylinder to minus cylinder o
the other way around
What type of image is formed by a minus lens? - ✔✔ANS virtual
A plus lens does what to a light ray that passes through it? - ✔✔ANS makes them converge
What does the term critical angle of a material mean? - ✔✔ANS ray of light is striking the surface at a
angle so that the ray is refracted along the surface of the lens
A minus lens with the optical center moved up creates? - ✔✔ANS base down prism
