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Using Light — Unit test Answers

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Which is one advantage of using a reflecting telescope instead of a refracting telescope?

A
Reflecting telescopes are less expensive.
B
Reflecting telescopes produce clearer images.
C
Reflecting telescopes require only concave lenses.
D
Reflecting telescopes usually take up less space.
2
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Makori drew the diagram below to show how a light microscope works.

Question illustration
A
Change the label “Virtual image from objective lens” to “Real image from objective lens.”
B
Switch the locations of the eyepiece lens and the objective lens.
C
Move the light so it is shining downward from the eyepiece lens toward the objective lens.
D
Replace “Convex” with “Concave” on the label for the eyepiece lens.
3

What kind of image does the lens in a camera produce?

A
real and upside down
B
real and right-side up
C
virtual and upside down
D
virtual and right-side up
4

Which best explains how fiber-optic technology has improved communication?

A
It has eliminated the need to send audio data through telephones.
B
It has allowed for faster transmission of Internet signals.
C
It has increased the speed at which light travels through space.
D
It has reduced society’s reliance on devices such as computers and cell phones.
5

Which best explains why one laser beam might appear blue and another laser beam might appear red?

A
The energy in laser beams is concentrated.
B
The energy in laser beams is scattered.
C
Each laser beam is made up of all visible wavelengths of light.
D
Each laser beam is made up of one specific wavelength of light.
6

A magnifying glass will produce a larger, virtual image because the glass is made of a ________ lens.Which best completes the statement?

A
convex
B
concave
C
mirrored
D
flat
7

Which best compares a nondigital and a digital camera?

A
A nondigital camera produces images using mirrors, and a digital camera produces them using lenses.
B
A nondigital camera produces a real image, and a digital camera produces a virtual image.
C
A nondigital camera uses a concave lens to capture light, and a digital camera uses a convex lens.
D
A nondigital camera uses film to record images, and a digital camera uses sensors.
8

Which is a use of fiber optics?

A
correcting vision problems
B
transmitting telephone signals
C
gathering light from distant objects
D
writing and reading CDs and DVDs
9

How are reflecting telescopes similar to devices that produce laser light?

A
Both use crystals to produce a beam of light.
B
Both have convex lenses that magnify objects.
C
Both have concave lenses that magnify objects.
D
Both use mirrors to reflect a beam of light.
10

Which is one use of lasers?

A
reproducing images to make them clearer
B
producing a magnified image of the moon
C
cutting an iron bar into two pieces
D
making a leaf appear larger so its veins are visible
11

What is a primary function of fiber-optic cables?

A
magnifying distant images
B
cutting through metals
C
carrying signals at high speeds
D
performing high-precision surgery
12

Which property of the coating on fiber-optic strands makes light visible only at the ends of the strands?

A
reflectivity
B
absorbency
C
transparency
D
translucency
13

Zach listed the process of how laser beams are produced with crystals.A flashlamp pumps energy through the crystal.Atoms in the crystal absorb and then release some of the energy as light. Light bounces off mirrors and occasionally bounces off crystal atoms, increasing in energy.Some light escapes the tube through the highly reflective mirror, forming a concentrated beam.

A
The crystal pumps energy through the flashlamp; the flashlamp does not pump energy through the crystal.
B
The atoms in the crystal do not release energy; they only absorb energy.
C
Light does not bounce off mirrors; it focuses through glass lenses.
D
Light escapes through the partially reflective mirror, not the highly reflective mirror.
14

Shanti began to draw a Venn diagram comparing refracting and reflecting telescopes.

Question illustration
A
“Uses a convex mirror”
B
“Uses a concave mirror”
C
“Uses a concave eyepiece lens”
D
“Uses a convex eyepiece lens”
15

Which is a property of laser light that makes it useful for cutting metals?

A
its focused energy
B
its single color
C
its scattered energy
D
its multiple colors
16

Greg is giving a slide show presentation to a large audience. How might a laser best help him with the presentation?

A
He can use the laser to enlarge images on the slides.
B
He can use the laser to point to specific information on the slides.
C
He can use the laser to scan and record information about the slides.
D
He can use the laser to make the images more clear.

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