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NAO Volume 2: Questions With Proper Answers
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NAO Volume 2: Questions With Proper Answers
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NAO Volume 2: Questions With Proper AnswersAbsorption Right Ans - 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) Right Ans - the angle a ray of light is changed from its
original path
Diffuse Relection Right Ans - a reflection from a rough surface- the
reflection does not produce a clear image
Incidence (Angle of) Right Ans - the angle which a ray of light makes the
surface of a refracting medium
Reflection Right Ans - the return of light waves from a surface the
production of an image
Refraction Right Ans - the bending of light when going from one medium
into another
Refraction (Angle of) Right Ans - the angle created when a ray of light
passes from one medium into another
Specular Reflection Right Ans - the forming of a clear image when light
strikes a surface
Why is a red pencil red? Right Ans - It reflects red rays back toward the eye
and absorbs all the other rays of visible light
Why is the blacktop black? Right Ans - 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? Right Ans - 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? Right
, Ans - 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?
Right Ans - 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?
Right Ans - 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? Right Ans - 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? Right Ans - 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? Right Ans - absorbed, reflected, refracted
What is the difference between a high index lens and a aspheric lens Right
Ans - high index refers to the material of the lens; aspheric refers to the
surface design of the lens
What is transposition? Right Ans - 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? Right Ans - virtual
A plus lens does what to a light ray that passes through it? Right Ans -
makes them converge
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