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NAO VOLUME 2 EXAM QUESTIONS AND CORRECT ANSWERS
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NAO VOLUME 2 EXAM QUESTIONS AND CORRECT ANSWERS...
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In terms of light and lenses, absorption means that when a light ray enters alens, not all of it will pass through the lens.
Deviation (Angle of): ANSWER the angle at which a light ray deviates from its
original direction
What is diffuse reflection? It's a reflection from a rough surface, and it doesn't
make a clear picture.
Incidence (Angle of): ANSWER the angle at which a light ray hits the surface
of something that bends light.
To make a picture, light waves bounce back off of a surface. This is called
reflection.
Refraction is the way light bends when it moves from one material to another.
The curve that is made when a light ray moves from one medium to another is
called refraction.
Specular reflection is when light hits a surface and makes a clear picture.
What makes a red pencil red? — ANSWER It turns red light back toward the
eye and takes in all other visible light.
What makes the road black? — ANSWER It does not send any rays back
toward your eye; instead, it takes them all in.
What makes the exciting light green if it goes through a green lens on
sunglasses? — ANSWER The lens bends green light through it, and the dyes in
the lens material soak up all other color light.
, When a light ray goes from air to water, which is heavier than air, what happens
to the light ray if it is not parallel to the surface? — ANSWER As long as the
ray stays straight, it slows down and doesn't change direction. It isn't deviated or
shifted.
As a light ray moves from air to water, which is heavier than air, what happens
to the light ray if it is not parallel to the surface? — ANSWER The ray slows
down and changes direction toward the normal if it is not parallel to the surface.
It has gone off its original path.
What does a light ray do as it goes from water to air, which is less common than
water? What if the light ray is parallel to the surface? — ANSWER When the
ray is parallel to the surface, it moves faster but doesn't change direction. It isn't
deviated or moved.
When a light beam moves from water to air, which is less common than water,
In the event that the light ray is not parallel to the surface, what will happen to
it? — ANSWER The ray moves faster and changes direction away from the
normal if it is not parallel to the surface. It has been swayed from its original
path.
How do you explain "critical angle"? - THE ANSWER is that a light ray
leaving a denser material is heading straight down the surface of a rarer material
that is at an angle to the normal. The ray will reflect inside the material if the
angle of incidence is bigger than the critical angle. It will not leave the material
for the rarer one.
A light ray can go through three different things when it goes through a lens. -
ANSWER: absorbed, reflected, and bent
What's the difference between an aspheric lens and a high index lens? It's the
material of the lens that is called "high index," and its shape on the outside is
called "aspheric."
What does transposition mean? The answer is that a prescription can be changed
from a plus cylinder to a minus cylinder or the other way around.
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