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Light — Test Answers

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When all else remains the same, what effect would decreasing the focal length have on a convex lens?

A
It would cause the lens to produce only real images.
B
It would make the lens weaker.
C
It would cause the lens to produce only virtual images.
D
It would make the lens stronger.
3
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Which describes an image that a concave mirror can make?

A
The image is never upside down.
B
The image can only be the same size as the object.
C
The image can be either virtual or real.
D
The image is always virtual.
4

After the 1600s, how did observations of light being refracted change the way most scientists thought about light?

A
They no longer believed that light acted as particles.
B
They began to believe that light acted as waves.
C
They no longer believed that light acted as waves.
D
They began to believe that light acted as particles.
5

What is the relationship between radiopharmaceuticals, tracers, and radionuclides?

A
A tracer is part of a radiopharmaceutical, which functions as a radionuclide.
B
A radiopharmaceutical is part of a radionuclide, which functions as a tracer.
C
A radionuclide is part of a radiopharmaceutical, which functions as a tracer.
D
A tracer is part of a radionuclide, which functions as a radiopharmaceutical.
6

Mavis looks through her father’s glasses and notices that everything looks smaller. What should she conclude about her father’s vision?

A
Her father is nearsighted and wears convex lenses to correct it.
B
Her father is farsighted and wears concave lenses to correct it.
C
Her father is nearsighted and wears concave lenses to correct it.
D
Her father is farsighted and wears convex lenses to correct it.
7

When light bends as it passes from one transparent object to another, the light is ________. Which best completes the statement?

A
refracted
B
reflected
C
absorbed
D
bounced
8

How is an image formed by a plane mirror?

A
Light bounces off of the mirror and then appears to come from in front of the mirror.
B
Light passes through the mirror and then appears to come from in front of the mirror.
C
Light bounces off of the mirror and then appears to come from behind the mirror.
D
Light passes through the mirror and then appears to come from behind the mirror.
9

Which part of the eye is simply an opening through which light passes?

A
pupil
B
lens
C
iris
D
retina
10

If humans cannot see ultraviolet waves, how can ultraviolet light be used to gather evidence of a crime?

A
Ultraviolet light causes substances to fluoresce and give off visible light.
B
Ultraviolet light shows cold areas as blue and warm areas as red.
C
Ultraviolet light detects the presence of radioactive substances.
D
Ultraviolet light transmits information to AM and FM radio receivers.
11

Mina enters a dark movie theater, where it takes her eyes a minute to adjust to the darkness. Which change helps her see better in the dark?

A
Her retinas make more rods.
B
Her pupils get larger.
C
Her corneas become more transparent.
D
Her cones become more active.
12

Light falling on the blind spot is not detected because it is the point where the retina connects to

A
the vitreous humor.
B
the optic nerve.
C
cones.
D
rods.
13

Prisms separate ________ light, such as that from the Sun, by wavelength. Which best completes the statement?

A
infrared
B
ultraviolet
C
white
D
black
14

A museum sets up a display of fluorescent minerals. Which best describes how electromagnetic waves can be used to enhance the display?

A
Ultraviolet light shining on the minerals will cause them to give off visible light.
B
Infrared light shining on the minerals will cause them to give off visible light.
C
Visible light shining on the minerals will cause them to give off infrared light.
D
Visible light shining on the minerals will cause them to give off ultraviolet light.
15

Where do the three rays in a ray diagram start?

A
at a focal point on the same side of the lens
B
at a focal point on the opposite side of the lens
C
at three different points on the object
D
at a single point on the object
16

Which part of the electromagnetic spectrum is necessary for the sense of sight in humans?

A
gamma rays
B
infrared light
C
radio waves
D
visible light
17

The use of radioisotope imaging is best suited for which procedure?

A
to pinpoint blockages in very small blood vessels
B
to monitor the function of an enzyme in the cells of the pancreas
C
to detect a small metal fragment embedded in the thigh
D
to help place a stent in a heart patient’s artery
18

Radioisotopes often emit one or more types of radiation, including alpha particles, beta particles, and gamma rays. The distance the radiation travels through matter before being absorbed increases in order from alpha to gamma. Which statement describes the best radioisotope that can be used for radioisotope imaging and for radionuclide therapy?

A
It emits beta particles and gamma rays.
B
It emits alpha and beta particles.
C
It emits only gamma rays.
D
It emits only alpha particles.
19

Which best describes what happens when light traveling through air enters water at an angle?

A
It moves in a curve in air and continues moving in the same curve when it enters water.
B
It moves along straight lines in air and continues along the same lines when it enters water.
C
It moves along straight lines in air and changes direction when it enters water.
D
It moves in a curve in air and moves in straight lines when it enters water.
20

Green plants need light in order to survive. Structures in the leaves absorb light, which in turn, helps plants make their own food. Under which color of light will plants be least likely to make food?

A
orange
B
red
C
green
D
blue
21

Which part of the electromagnetic spectrum has the longest wavelengths?

A
gamma rays
B
radio waves
C
ultraviolet light
D
infrared light

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