Using LasersUsing Lasers

Using Lasers

Wri

Wri te About I te About I t t

Writ

Write a paragraph e a paragraph about another way that lasersabout another way that lasers are used to help people. Organize the steps in are used to help people. Organize the steps in time order, from first to last.

time order, from first to last. Use informationUse information from the chapter and from online resources.

from the chapter and from online resources.

Getting Ideas Getting Ideas

Do some print and

Do some print and online research. Find five ways we use lasers toonline research. Find five ways we use lasers to help us.

help us. WritWrite them on e them on a separate sheet of paper.a separate sheet of paper.

Planning and Organizing Planning and Organizing

Gloria wants to write about using a

Gloria wants to write about using a laser level to hang twolaser level to hang two pictures. Here

pictures. Here are some steps that are some steps that she wrote. Writshe wrote. Write 1 by the e 1 by the stepstep that should come first. Number the last step 4.

that should come first. Number the last step 4.

A. Next, havNext, have a friend use a e a friend use a pencil to pencil to mark two points along mark two points along thethe line. These points show where to hang your pictures.

line. These points show where to hang your pictures.

B. Push the “Push the “on” button” button. This shoots a on. This shoots a laser beam to laser beam to thethe opposite wall.

opposite wall.

C. First, decide how high First, decide how high you wyou want the pictures tant the pictures to be. Place theo be. Place the laser level at this height at one corner of the wall.

laser level at this height at one corner of the wall.

D. Finally, Finally, attach two picture attach two picture hangers to thangers to the wall at he wall at these points.these points.

Hang your pictures.

Now think about the object you chose. Write five steps showing Now think about the object you chose. Write five steps showing how to use it.

how to use it.

165

Chapter 8 • 165

Chapter 8 • Light Light Use Use withwith Lesson 3Lesson 3 Reading

Reading and and Writing Writing in in Science Science ShadowsShadows

Writing Writing

Drafting Drafting

Here are t

Here are two sentences Gloria wrotwo sentences Gloria wrote to begin her e to begin her paragraph.paragraph.

Circle the one she should use.

We e use use lasers lasers in in many many different different wayways.s.

A laser laser level level can can help help you you solve solve a a simple, simple, everydaeveryday y problem.problem.

Writ

Write a e a topic sentence for your paragraph.topic sentence for your paragraph.

Now write your paragraph on a separate piece of paper. Begin Now write your paragraph on a separate piece of paper. Begin with a topic sentence. Write the steps in time order.

with a topic sentence. Write the steps in time order.

Revi

Revising a sing and nd Proofreading Proofreading

Proofread these sentences that Gloria wrote. Find five errors and Proofread these sentences that Gloria wrote. Find five errors and correct them.

correct them.

Have you ever tried to hang too pictures side-by-side. No matter Have you ever tried to hang too pictures side-by-side. No matter how hard you try, one picture is usally higher than the other. A laser how hard you try, one picture is usally higher than the other. A laser level can help you solve this problem. It is easy to use and it doesnt level can help you solve this problem. It is easy to use and it doesnt cost alot

cost alot of money.of money.

Now revise and proofread your paragraph. Ask yourself:

•

• Did Did I I begin begin with with a a topic topic sentencesentence??

•

• Did Did I I put put the the steps steps in in time time order?order?

•

• Did Did I I use use sequence sequence words words such such as as first, nefirst, next, xt, and and finally?finally?

•

• Did Did I I correct correct all all grammar grammar errors?errors?

•

• Did Did I I correct correct all all spelling, spelling, punctuation, punctuation, and and capitalization capitalization errors?errors?

166

166 Chapter 8 •Chapter 8 • Light Light Use Use withwithLesson 3Lesson 3 Reading

Reading and and Writing Writing in in Science Science ShadowsShadows

Vocabulary Vocabulary

Light Light

Choose the letter of the

Choose the letter of the best answerbest answer.. 1.

1. The part of the The part of the eye eye that focuses incoming that focuses incoming light is tlight is thehe a.

a. clear outclear outer cer covering.overing. c.c. lens. lens.

b. iris. iris. d.d. pupil. pupil.

2. When whitWhen white light strike light strikes an object, some colors of light es an object, some colors of light areare a.

a. absorbed. absorbed. c.c. destroyed. destroyed.

b. bright. bright. d.d. directed. directed.

3. These materials do These materials do not absorb not absorb or reflect much or reflect much of theof the light en

light energyergy.. a.

a. corneas corneas c.c. opaque opaque b.

b. translucent translucent d.d. transparent transparent 4.

4. The colored The colored circle thacircle that surrounds t surrounds the pupil the pupil is theis the a.

a. cornea. cornea. c.c. iris. iris.

b. direction. direction. d.d. lens. lens.

5. Materials that Materials that absorb some lighabsorb some light energy and t energy and let some lightlet some light energy pass through are

energy pass through are a.

a. absorbed. absorbed. c.c. translucent. translucent.

b. shadows. shadows. d.d. transparent. transparent.

6. The light tThe light that bounces off an object is called a(hat bounces off an object is called a(nn)) a.

a. invisible light. invisible light. c.c. path. path.

b. mirror. mirror. d.d. reflection. reflection.

167 167

Name

Name DateDate

Chapter 8 •

Chapter 8 • LightLight Chapter Vocabulary TestChapter Vocabulary Test Reading and Writing in Science

Reading and Writing in Science

Choose the letter of the

Choose the letter of the best answerbest answer.. 7

7.. Light is Light is another form another form of energy of energy transferred bytransferred by a.

a. currents. currents. c.c. reflection. reflection.

b. direction. direction. d.d. waves. waves.

8. Materials thaMaterials that absorb t absorb some of tsome of the light he light energy areenergy are a.

a. blocked. blocked. c.c. opaque. opaque.

b. clear. clear. d.d. transparent. transparent.

9. When light When light energy is energy is blocked, this blocked, this formsforms a.

a. an image.an image. c.c. a a shape.shape.

b. a reflection. a reflection. d.d. a shadow. a shadow.

10.

10. The clear outer The clear outer covcovering of the ering of the eye eye is theis the a.

a. cornea. cornea. c.c. object. object.

b. eyelid. eyelid. d.d. pupil. pupil.

11.

11. An opening An opening into tinto the eyhe eye is te is thehe a.

a. cornea. cornea. c.c. pupil. pupil.

b. iris. iris. d.d. reflection. reflection.