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Worksheets10th P.S quiz- 12(Refraction at plane surfaces) by PRABHAKAR
Total questions: 40
Worksheet time: 20mins
for total internal reflection?
A) The angle of incidence is equal to the critical angle.
B) Light must travel from rarer medium to denser medium
C) Light must travel from denser medium to rarer medium
D) The angle of incidence is lesser than the critical angle.
E) both B and D
Which are NOT correct for total internal reflection to take place
1.The incident angle should be less than the critical angle
2.The incident angle should be greater than the critical angle
3.Light should travel from a rarer to a denser medium
4.both 1 and 3
Which diagram correctly describes the critical angle c for air-water surface?
A
B
C
D
Which property of light is responsible for the given, phenomenon?
Dispersion
reflection
total internal reflection
Difrefractionfraction
A ray of light travels from glass to airs with an angle of incidence of 30o. If the critical angle is 42o what will happen at the boundary?
refraction takes place
total internal reflection takes place
travel along the boundary
can't say
A: the diamond shines due to Total internal reflection.
R: the critical angle for diamond is 24.40
Both A and R are true; and R is correct explanation of A
Both A and R are true;but R is not correct explanation of A
A is true but R is false
A is false and R is true
The distance between the incident ray and emergent ray through the glass slab is called .........
lateral shift
vertical shift
deviation
refractive index
Can you take the photo of a mirage?
no
yes
some times
can't say
Which is more optical denser medium
Cold air
Hot air
Both cold and hot air have same optical density
vacuum
which one of the following is an application of total internal reflection
blue colour of sky
rainbow
optical fibre
twinkling of stars
Suppose you are standing on the edge of the swimming poo, your friend is inside the water in swimming pool, then You appear to your friend as--------
Shorter
Taller
Same size
Stout
Light travels through a liquid at 2 x108 m/s. What is the refractive index of the liquid?
1.33
0.6
1.5
2
How the charecteristics of light affected by an increase in the refractive index of the medium?
Its frequency increases
Its frequency decreases
Its speed increases
Its speed decreases
What happens to the speed and frequency of a light ray when it passes from air to water?
The speed decreases and the frequency increases
The speed decreases and the frequency remains the same
The speed increases and the frequency increases
The speed increases and the frequency remains the same
If the refractive index of a certain material is n = 1.5, the speed of light in that material is ________.
2 x 108 m/s
1.5 × 108 m/s
3.0× 108 m/s
6.0 × 108 m/s
For light to pass from medium (1) of index n1 to medium (2) of index n2 where n2 < n1, the angle of incidence must be ……………… than the refracted angle.
greater
smaller
equal
can't say
Units of refractive index
m/s
m/s2
No units
gr/cc
Which of the following characteristics is not altered during refraction of light
Speed
Frequency
Wavelength
all the above
from the given figure light travels from
Denser to rarer
Rarer to denser
denser to denser
rarer to rarer
In which medium from the figure speed of light is less
Medium 1
Medium 2
In both media is same
Can't say
If n1 and n2 are the refractive indices of rarer and denser medium respectively, then the relation between n1 and n2?
n1=n2
n1 >n2
n1 <n2
can't say
Relative refractive index of any medium is _______.
less than 1
greater than 1
1
all the above
When light ray travels from rarer medium with velocity vr to denser medium with velicity vd, the relation between vr and vd is -----
vr > vd
vr < vd
vr = vd
can't say
Refractive index of glass relative to glass is 9/8. What is the refractive of water relative to glass is ---
1
7.2
8/9
9/8
1 micrometer =
10-3m
10-9m
10-6m
106m
"Light always choose the path which takes least time to travel" this statement is known as
snell's law
Fermat's principle
Hunds rule
Aufbau principle
Relative refractive index (n21) = ----------------
n2 / n1
n1 / n2
n1 X n2
none of the above
If light travels from denser medium to rarer medium, if the angle of refraction is equal to 900, the the incident angle is called as
total internalreflection
refractive index
emergent angle
critical angle
Relation between critical angle (C) and refractive index (n) is ----
n = sinC
n = 1/sinC
n = Tan C
nxsinC = 0
Refractive indices of water and kerosene are 1.33 and 1.44, which is the optical denser medium
water
kerosene
both have same optical density
can't say
light incident normally on the surface of glass from air, then
then it bends towards normal
it bends away from the normal
it passes without deviation
we can't say
Refractive index of glass with respect to air is 2, then the critical angle between air-glass surface is ---
450
600
300
900
Absolute refractive index = ----------
speed of light in one medium / speed of light in another medium
speed of light in medium / speed of light in vacuum
speed of light in vacuum / speed of light in medium
all the above
The refractive index of a medium is 'n'. Then the speed of light in that medium is equal to....
n times to the speed of light in vacuum
nth part of the speed of light in vacuum
speed of light in vacuum
can't say
what is the relation between optical density and mass density
if mass density is more, it is optically denser medium
if mass density is less, it is optically denser medium
there is no relation between them
all the above
What is the refractive index of diamond
1.5
2.24
2.42
1.0003
At critical angle of incidence, the angle of refraction is ___
0 0
30 0
45 0
90 0
The angle of deviation produced by the glass slab is -----
0 0
20 0
90 0
Depends on the angle formed by the light ray and normal to the slab
Refractive index of glass slab =
Thickness of slab / vertical shift
Thickness of slab / thickness of slab - vertical shift
Thickness of slab / thickness of slab - lateral shift
Thickness of slab / lateral shift
