Download Unit 12 - Hingham Schools

Unit XII: Ch.17 “Reflection & Mirrors”, Ch.18 “Refraction & Lenses”
Standards 4.2, 4.4, 6.1, 6.2 Massachusetts Curriculum Frameworks, October ‘06
Day 1- The Electromagnetic Spectrum
Students will read p.p. 705-708 and we will answer questions to discuss what a light wave is.
Students will be assigned a portion of the EM spectrum to research. I may handout readings or
students might go on the computers. Groups will report to the class on what they learned. We will
refer to an overhead showing the spectrum as they present.
HW- p. 452 #25, 33, 39, 54, 58, 59, 68
Day 2- Reflection Lab
Students will perform the reflection lab with plane mirrors and straight pins to investigate the
relationship between the object and image distance and to observe how light bounces off a mirror.
HW- p. 478 #31-33, 45
Day 3- Reflection Notes/Practice
We will discuss the results of the lab and do some practice involving reflection. I will go over the
two types of curved mirrors and how they also follow the law of reflection.
HW- p. 479 #42, 53- 55, 57 part a only
Day 4- Refraction Lab
After correcting the homework students will perform the refraction lab to investigate how light
bends when it enters a new medium.
HW- p. 508 #38, 39, 53-55
Day 5- Refraction Notes and Optical Illusions
We will discuss the results of the lab and I will go over Snell’s Law. After doing a couple of example
problems, students will observe different optical illusions in stations. We will discuss their
observations and see how each one depends on refraction.
HW- p. 509 # 67-70, 75
Day 6- Critical Angle and Total Internal Reflection
After correcting the homework we will take notes on total internal reflection. We will do an
example problem with a glass prism which has a 90º angle. I will demonstrate to the students with a
laser and a prism that the answer is correct. To practice Snell’s law and apply their understanding
of critical angle, students will calculate and trace the path of three light rays through a diamond.
HW- p. 510 # 76, 77, 79, 95
Day 7- Lenses Lab
After correcting the homework, I will go over what focal length means using a magnifying glass and
students will perform a lab involving double convex lenses. The first part of the lab is an
experimental means of finding images. In the second part students will find the location of an
image using ray diagramming. The results of each part should be the same and students will find
there is a pattern between the object and image distances.
HW- Analysis Questions
Day 8- Eyesight
Students will analyze how a magnifying glass can be used to enlarge an object by doing a ray
diagram. We will then look at a double concave lens briefly. Finally we will analyze some scale
drawings to discuss near and farsightedness.
HW- Review Packet
Day 9- Color
Through demonstrations and discussions I will go over the primary and secondary colors of light and
pigments. Students will answer questions to apply their understanding of the concepts discussed.
If necessary I will do more demonstrations as we go over the answers. If there is time we can
discuss rainbows, the color of the sky or other applications of color.
HW- Review Light Waves