Chapter 18: Refraction and Lenses

Refraction and Lenses:

Light changes speed when it passes into a medium with a different index of refraction. This change in speed alters the direction of the light if it strikes the boundary at an angle. Light that passes through a lens may produce an image with a size and an orientation that are different from those of the original object. The eye and optical instruments are able to obtain clear images of small or distant objects because of the refraction of light.

Power Standards:

Students will be able to read and solve physics problems by writing down what is given in the problem, choosing the correct equation, and calculating the correct answer with the appropriate unit.
Students will be able to read laboratory investigations, follow the directions, use laboratory equipment properly, follow safety instructions, and analyze the data to help apply physics concepts learned.
Students will be able to compare and contrast reflection and refraction as it relates to light reflecting off of mirrors and refraction through lenses.

Learning Targets:

Learning targets are what the students will be assessed on.

Physics Knowledge:

PK 18.1 - I can explain the concept of refraction in terms of optically dense mediums and predict how light will bend as it moves into new mediums. Chapter 18, Lesson 1
PK 18.2 - I can apply mirages, dispersion, total internal reflection, and critical angle to various situations involving refraction. Chapter 18, Lesson 1
PK 18.3 - I can describe different types of lenses and distinguish between real and virtual images. Chapter 18, Lesson 2
PK 18.4 - I can draw and interpret ray diagrams of light to determine the location, size, and orientation of images in lenses. Chapter 18, Lesson 2
PK 18.5 - I can describe chromatic aberration and be able to explain how to correct the problem in lenses. Chapter 18, Lesson 3
PK 18.6 - I can classify the different parts of an eye and be able to explain how to correct deficiencies in eyesight. Chapter 18, Lesson 3

Math:

M 18.7 - I can use the five steps to calculate the unknown physics variable in this chapter. Chapter 18, Lesson 4
M 18.8- I know the abbreviations/units for all the previously learned terms and the terms in this chapter. Chapter 18, Lesson 4

Standards Based Grading Scale:

All of the above learning targets will be assessed with the following scale:

4 - Advanced. The learner has demonstrated a high level of conceptual and procedural understanding of the specific knowledge and skills.

3 - Proficient. The learner has demonstrated understanding of the specific knowledge and skills.

2 - Beginning. The learner is emerging but does not yet demonstrate understanding of specific knowledge and skills.

1 - The learner has provided some evidence, but not enough to assess proficiency.

0 - The learner has provided no evidence of the skill.

Learning targets will be added to MiStar at the beginning of the chapter and grades (0-4) will be entered as the students meet with the teacher and demonstrate their understanding of the learning targets. Learning target grades may not be added at the same time. If there is a blank, then the student may not have had the opportunity to demonstrate thier knowledge yet. A grade entered as zero means that they had the opportunity to demonstrate their knowledge and they chose not to.

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