CONCEPT: The path of light may be affected by lenses.
CONTENT OBJECTIVE: 5C1.00 To understand the difference between concave and convex surfaces
INSTRUCTIONAL OBJECTIVES: The learner will:
1.01 discover that a lens is a curved piece of glass or other transparent material.
1.02 discover that there are two kinds of lenses.
1.03 discover that a convex lens is a magnifying or focusing lens.
OUTLINE OF CONTENT:
I. Define lens
II. Types of lenses
TN COMPONENT OF SCIENCE: Habits of Mind
To enable students to demonstrate ways of thinking and
acting inherent on the practice of science; and to exhibit an
awareness of the historical and cultural contributions to the
enterprise of science.
3.6 CREATIVE ENTERPRISE - Creativity contributes to
the process of science through ideas and inventions.
TN STANDARD(S): The learner will understand that:
3.6a Imagination plays an integral role in science.
BENCHMARK: Science engages the creative nature of all people
BENCHMARK: The process of invention is driven by need and individual insight.
3.6b Creativity is both a mental and a physical process.
BENCHMARK: Higher order thinking skills, when directed toward the process of science, may produce unique solutions or results.
One instructional period for each terminal objective
Partition board, curtain, small mirrors, poster board for diagram, poster board for rectangles and/or graph paper, several objects that have lenses, teacher-made ditto
I want you to look at the objects that I have here. When I call your name, tell me one of the objects. What do all of these objects have in common? (They all have lenses.) What are some objects, not here, that have lenses? (response) Today we are going to learn about different kinds of lenses.
(This lesson should be taught on a sunny day.) We learned in another lesson that light travels in a straight line. Can that line be bent? (response) Can it pass through matter? (Some matter) A lens is a piece of glass or other clear material that brings together or spreads apart rays of light passing through it. (Write this definition on the board.) Now, read this with me.
There are two kinds of lenses. They are convex and concave. Convex lenses magnify. (Demonstrate these by putting a drop of water on a page of written work. Have students observe how the water magnifies.) Concave lenses make things appear smaller. (Draw shapes of concave and convex on the board. Have students take two sheets of paper and draw convex shape on one card and concave on the other.) I am going to ask you some questions. If the answer is concave, hold up the sheet on which you have drawn the concave shape. If the answer is convex, hold up the sheet with the convex shape. (Example: Which lens magnifies? Which lens makes things appear smaller?)
Today we have discussed what lenses do and what types
of lenses there are. Read with me the sentence on the board that
defines lenses. (response) Get your cards ready. Which lens magnifies?
(response) Which lens makes things appear smaller? (response)
Today we have learned that lenses can be used to make work easier.
In your journals, make a list of all the devices you can think
of that use lenses. For each device, tell how it helps make work
Lenses are man made. Someone back in history invented them using their creativity. (Divide into groups) Discuss how you think someone got the idea to make a lens. Share your ideas with the class.
(Give students work sheet with pictures of various lenses: magnifying glass, binoculars, etc. Students are to label the object as convex or concave. They are also to draw a convex lens and a concave lens and write a complete sentence to tell what each does.)
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