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Drexel SDP GK 12 ACTIVITY Subject areas Unit title physical science Astronomy Holt Astronomy activities Activity title Grade level Reflection and refraction Holt Chapter 1 6 Time required 60 minutes Keywords reflection refraction light Educational standards 3 4 7D Portions of this lesson plan were permissibly adapted from Joshua Faber http w3 physics uiuc edu jfaber optics1 html Concept Vocabulary In this activity students investigate the behavior of light as it passes from one transparent medium air to another water They will use and investigate the concepts of reflection and refraction by studying the behavior of light as it travels through the air and through a tank of water They will also use the Holt text and other resources to review the astronomy terms telescope refraction refracting telescope reflecting telescope electromagnetic spectrum Students will exercise geometric concepts of angles and symmetry They will practice measurement skills using sketches and protractors Objectives Students will learn and understand how light can be reflected and refracted This activity will aid in the understanding of how light behaves in reflecting and refracting telescopes INSTRUCTIONAL STRATEGIES Group size This activity can be performed in groups of 4 6 students Duration It can be performed in one class period Before Students will perform the Motivate Activity on page 8 of the Holt Astronomy Teacher Edition text They will construct a water drop lens They should learn how light traveling through a lens can be used to magnify an image During A small rectangular fish tank or other similar small clear enclosure should be set on top of white sheets of paper The paper should extend out beyond the tank on all sides The instructor should fill the tank with water Students will be asked what will happen to light if we shine a flashlight onto the surface They should be encouraged to briefly discuss within groups the direction or directions the light will travel One student from each



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