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5 th Grade Science Objective 3 Lesson 25 Reflection and Refraction of Light pps. 137-141

5 th Grade Science Objective 3 Lesson 25 Reflection and Refraction of Light pps. 137-141. At the end of this lesson, you will be able to predict how light will behave when it reflects, or bounces off a surface, or when it is transmitted, or passes through a curved piece of glass. Vocabulary.

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5 th Grade Science Objective 3 Lesson 25 Reflection and Refraction of Light pps. 137-141

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  1. 5th Grade ScienceObjective 3Lesson 25 Reflection and Refraction of Light pps. 137-141 At the end of this lesson, you will be able to predict how light will behave when it reflects, or bounces off a surface, or when it is transmitted, or passes through a curved piece of glass.

  2. Vocabulary • Refraction: • The bending of light that occurs when light moves from one material to another • Lenses: • Objects used to refract light • Reflection: • The bouncing of light from a surface • Absorb: • When light does not reflect or refract and mostly turns to heat.

  3. Guided Questions pps. 137-138 • What is reflection? • The bouncing of light from a surface • When is light transmitted? • When it passes through objects • What happens to absorbed light? • It is not reflected or refracted and mostly turns to heat.

  4. Guided Questions pps. 137-138 cont. • When does light refract? • When it passes from one kind of matter into another and is bent • How does a lens work? • It refracts light from an object as it goes through the glass

  5. Guided Instruction pps. 138-139 • When is light reflected? Give an example. • Light is reflected when it bounces off any object • Why does light refract? Give an example. • Light refracts when it passes through one kind of matter into another at different speeds.

  6. Guided Instruction pps. 138-139 cont. • Compare reflection and refraction. • Light refracts when it is transmitted through different kinds of matter, causing the speed of the light to change. Light reflects when it bounces back from a surface. • List three tools that use lenses to refract light. • Ex: eyeglasses, cameras, and microscopes. (Anything that contains lens)

  7. Guided Instruction pps. 138-139 • A diagram of a telescope is shown below. On the lines below, label each part of the telescope as either a mirror or a lens. A. Lens B Mirror C Mirror

  8. Apply the TEKS pps.139-140 • Where in the eye does refraction take place? • Refraction occurs in the lens.

  9. Apply the TEKS pps.139-140 • Describe what part of the eye detects light. • The retina detects light

  10. Apply the TEKS pps.139-140 • Based on the diagram above , how is light refracted when it goes through the lens in a normal eye? • Ex: The diagrams show the eye’s lens focusing light rays on the retina and upside down in a normal eye.

  11. Apply the TEKS pps.139-140 • How do you think eyeglasses could improve the sight of a nearsighted person? Explain • Ex: Lenses spread light rays apart or move light rays together. A nearsighted eye focuses light in front of the retina. Spreading the light will move the light farther back in the eye on the retina.

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