OCPP Volume 2 Exam Questions and Answers (Graded A)
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OCPP
OCPP Volume 2 Exam Questions and Answers (Graded A)OCPP Volume 2 Exam Questions and Answers (Graded A)OCPP Volume 2 Exam Questions and Answers (Graded A)
absorption - ANSWER-in terms of light and lenses-when a ray of light enters a lens some of the light will not completely travel through the lens...
OCPP Volume 2 Exam Questions and
Answers (Graded A)
absorption - ANSWER-in terms of light and lenses-when a ray of light enters a lens
some of the light will not completely travel through the lenses.
deviation - ANSWER-the angle a ray of light is changed from its originalpath
diffuse reflection - ANSWER-a reflection from a rough surface - the reflection does not
produce a clear image
incidence - ANSWER-the angle which a ray of light makes with 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 the pencil red? - ANSWER-it reflects red rays back toward the eye and absorbs
all 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 sunglass lenses, why will the exiting 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-it slows down but
does not change direction. it is not deviated or displaced
the ray is not perpendicular to the surface - ANSWER-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-it speeds up
but does not change direction. it is not deviated or displaced
the ray is not perpendicular to the surface? - ANSWER-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 for a
rarer material that is at an angle to the 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.
if a light ray travels from air to water with an angle of incidence of 15 degrees and an
angle of refraction of 11 degrees, how much was it deviated? - ANSWER-i=15 r=11 d=?
i=r+d 15=11+d d=15-11 d=4
if the light ray leaves the water traveling into air with an angle of incidence of 20
degrees and it is deviated by -7 degrees, what is the angle of refraction? - ANSWER-
i=20 r-? d=-7 i=r+d 20=r+(-7) r-7=20 r=20+7 r=27
if a ray of light travels from one material to another with an angle of incidence of 32 and
an angle of refraction of 26, what is the angle of deviation? is the ray travelling into the
lens or exiting from lens? - ANSWER-i=r+d i=? r=20 d=5 i=r+d i=20+5 i=25 the ray is
again entering the lens material.
a ray of light travels from one mater to another. the angle of incidence is 45 degrees
and the angle of refraction is 65 degrees. what is the angle of deviation? is the ray
entering the lens material or exiting from it? - ANSWER-i=r+d i=45 r=65 d=? i=r+d 45-
65+d d=45-65 d=-20 the ray is exiting from the lens material into air or another material
which is not as dense
if a ray of light is deviated by -14 degrees, and its angle of refraction is 25 degrees, what
was the angle of incidence? did it go from a faster medium to a slower medium, of from
a slower medium to a faster medium? - ANSWER-i=r+d i=? r=25 d=-14 i=r+d i=25-14
i=11 it went from slower to faster, or from more dense to less dense
focal power formula: D=1/f, where f is in meters:
D=39.37/f, where f is in inches. (1 meter=39.37 inches) - ANSWER-
find the focal lengths of the given lenses. D=+2.00Df= - ANSWER-.5M
a ray of light is deviated by -10 degrees from its path when it passes from one material
into another material. if it was originally travelling at an angle of 29 degrees to the
normal, what is its angle of refraction? it is travelling into the denser material or is it
exiting the denser material? - ANSWER-i=r+d i=29 r=? d=-10 29=r-10 r=29+10 r=39 the
ray is exiting the densest material
, when a ray of light leaves a lens medium and enters air it is travelling at an angle of 36
degrees to the normal. would the angle of incidence be greater than 36 degrees, less
than 36 degrees or equal to 36 degrees? (note: the word medium is used in place of
material. in this context they mean the same thing. you could use either term used on a
test.) - ANSWER-the ray is going from a dense material to air. the angle of incidence is
going to be less than 36 degrees.
a ray of light enters a diamond from air, travelling at an angle of 3 degrees from the
normal to the surface. if it is deviated from its original path by 2 degrees, what is its
angle of refraction? - ANSWER-i=r+d i=3 r=? d=2 i=r+d 3=r+2 r=3-2 r=1
because the sides of the diamond are carefully designed, the ray that entered the
diamond close to the normal might exit the opposite side at 20 degrees away from the
normal. if it is refracted through an angle of 55 degrees, how much has it been
deviated? - ANSWER-i=r+d i=20 r=55 d=? i=r+d 20=55+d d=20-55 d=-35
D=+10.00Df= - ANSWER-100 mm
D=0.50D f= - ANSWER-200 cm
D=-2.50D f= - ANSWER-400mm
Find the dioptric power of lenses having the following focal lengths. f=+4.0 meters, D= -
ANSWER-+0.25D
f=+20mm, D= - ANSWER-+0.005D
f=-.333mmm, D= - ANSWER--3.00D
f=-.25cm, D= - ANSWER--4.00D
what is the dioptric power of a lens with a focal length of each of the following? 25mm =
- ANSWER-40.00D
2.5mm= - ANSWER-400.00D
25cm= - ANSWER-4.00D
what is the focal length of a +5.00D lens in meters?= - ANSWER-.2
millimeters?= - ANSWER-200
what is the focal length of a +0.50D lens in centimeters? = - ANSWER-200
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