NAO Volume 2 2024/2025 updated questions with complete solution
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Course
NAO
Institution
NAO
Absorption - correct 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) - correct answer the angle a ray of light is changed from its
original path
Diffuse Relection - correct answer a reflectio...
NAO Volume 2 2024/2025 updated questions with
complete solution
Absorption - correct 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) - correct answer the angle a ray of light is changed from its
original path
Diffuse Relection - correct answer a reflection from a rough surface- the
reflection does not produce a clear image
Incidence (Angle of) - correct answer the angle which a ray of light makes the
surface of a refracting medium
Reflection - correct answer the return of light waves from a surface the
production of an image
Refraction - correct answer the bending of light when going from one medium
into another
Refraction (Angle of) - correct answer the angle created when a ray of light
passes from one medium into another
Specular Reflection - correct answer the forming of a clear image when light
strikes a surface
Why is a red pencil red? - correct answer It reflects red rays back toward the eye
and absorbs all the other rays of visible light
Why is the blacktop black? - correct 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? - correct 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? - correct
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? - correct
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? - correct
answer If the ray is perpendicular to the surface it speeds up but does not change
direction; it is not deviated or displaced
, NAO Volume 2 2024/2025 updated questions with
complete solution
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? -
correct 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? - correct 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? - correct answer absorbed, reflected, refracted
What is the difference between a high index lens and a aspheric lens - correct
answer high index refers to the material of the lens; aspheric refers to the surface
design of the lens
What is transposition? - correct 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? - correct answer virtual
A plus lens does what to a light ray that passes through it? - correct answer
makes them converge
What does the term critical angle of a material mean? - correct 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? - correct answer base
down prism
A base-up prism - correct 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? - correct answer 400-
720 nanmometer
the wavelengths of light that are the most pleasing to the eye are? - correct
answer blue-green
The breakdown of light into its component colors is called? - correct answer
dispersion
The point on a lens which a ray of light will pass through without being deviated is
called? - correct answer optical center
The lower the abbe number the... - correct answer more the chromatic
aberration
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