NAO VOLUME 3 CERTIFICATION REVIEW
2026 COMPLETE GUIDE GRADED A+
⩥ 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
2026 COMPLETE GUIDE GRADED A+
⩥ 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
