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WorksheetsTaher physics- Refraction and Lenses
Total questions: 27
Worksheet time: 26mins
How is information carried in an optical fiber?
by sound
by different colors
by electrical impulses
by light
For the situation shown in the figure below, which of the substances listed below should be chosen to put in front of the pencil to make its "break" the most pronounced?
flint glass
vacuum
ethanol
water
A light ray is traveling through an unknown material when it intersects ethanol (n = 1.36) at an incident angle of 62.0°. If the angle of refraction is 46.4°, what is the index of refraction of the unknown material?
1.12
1.66
0.985
2
If a refracted ray moves away from the normal, the speed of light of the ray
in this material is __________ that of the incident ray.
unrelated to
less than
greater than
the same as
If a substance has a critical angle of 50°, what happens to the light from an incident angle hitting the boundary at 30°?
It is stopped
It is reflected
It is diffused.
It is refracted
What is dispersion?
the separation of light into its spectrum
the refraction of light
the combining of colored light into white light
the reflection of colored light
The incident angle that causes a refracted ray to lie along the boundary of a substance is the __________.
refracted angle
reflected angle
critical angle
normal angle
What is the speed of light in a diamond (n = 2.42)?
2.42×108 m/s
1.24×108 m/s
7.26×108 m/s
3.00×108 m/s
A light ray traveling through crown glass (n = 1.52) intersects a sheet of flint glass (n = 1.61) at an angle of 27.3°.
What is the angle of refraction?
0.839°
33.0°
25.7°
0.433°
According to Snell's law, light traveling from a vacuum to glass will __________
speed up
travel at the same speed
stop completely
slow down
Because of refraction, the Sun actually sets __________ we see it disappear.
after
before
at the same time as
hours before
A beam of light travels through air (n = 1.0003) and strikes an unknown material at an angle of 50.0°. The new angle of refraction is 25.0°. What is the index of refraction of this material?
0.643
1.2
1.81
0.709
What happens to light during total internal reflection?
The angle of refraction is less than the critical angle
The angle of incidence is greater than the critical angle
The angle of incidence is 0
The angle of reflection is the same as the critical angle.
Optical fibers are a technical application of __________.
diffraction
dispersion
total internal reflection
refraction
The focal length of a concave lens is __________
negative
reduced
magnified
positive
In the figure below, if the bottom half of the lens is covered, what will happen to the image?
Nothing
The bottom half of the image will disappear
The top half of the image will disappear
The image will become dimmer
In the figure below, if you wanted to make the virtual image larger, what could you do?
Move the object further out, but not past the focal point.
Replace the object with a shorter object.
Replace the lens with one of larger focal length
Replace the lens with a taller one.
An object is placed 20.0 cm away from a convex lens with a focal length of 12.0 cm. At what distance will the image form and what is its orientation?
30.0 cm, upside down
7.50 cm, upright
7.50 cm, upside down
30.0 cm, upright
An object is placed 27.0 cm away from a concave lens and forms an image that is 10.8 cm in front of the lens. What is the focal length of the lens?
7.71 cm
–18.0 cm
–7.71 cm
18.0 cm
A ray of light striking perpendicular to an optically dense surface will __________.
refract away from the normal
reflect
refract toward the normal
remain straight
Through which medium is the speed of light the fastest?
air
water
vacuum
glass
A concave lens is also known as a __________ lens
concave
converging
diverging
plane
In nearsightedness, the image is focused __________
in front of the retina
beyond the retina
directly on the retina
in front of the eye
Farsightedness can be corrected with a __________.
parabolic lens
convex lens
concave lens
plane lens
An object of 5.0 cm height forms an image of 15 cm height in a convex lens. What is the magnification of the lens?
3
5
15
75
Which statement is true about focal length, f, in concave lenses?
It is negative.
It is positive.
It is twice image position.
It is one-half image position.
Which equation shows the correct relationship between object position, image position, and focal length in a curved lens?
f = x I + x O
f1=xo1+xi1
xo1=f1+xi1
