Unit:

Light and Reflection

Topic:

Flat Mirrors

Lesson Objective:

Students will apply the law of reflection to flat flat mirrors and describe the nature of images formed by flat mirrors.

Materials:

Mirrors (flat)

State Frameworks:

WO.10.P.1 Calculate the frequency and wavelength of electromagnetic radiation

WO.10.P.2 Apply the law of reflection for flat mirrors: θ in = θ out WO.10.P.3 Describe the images formed by flat mirrors

NGSS

P-PS4-1AR Use mathematical representations to support a claim regarding relationships among the frequency, wavelength, speed, and energy of waves traveling in various media. [Clarification Statement: Emphasis is on the dependence of wave speed upon media properties and the proportionality between the quantities (frequency and speed, wavelength and speed, frequency and wavelength, energy and wavelength).]

P-PS4-3AR Develop and use models to describe the interaction of light with matter. [Clarification Statement: Emphasis is on both geometric (ray diagrams) and algebraic models (mirror and thin lens equation, Snell's law).]

CCSS:

RST.11-12.3 Follow precisely a complex multistep procedure when carrying out experiments, taking measurements, or performing technical tasks; analyze the specific results based on explanations in the text.

WHST.11-12.4 Produce clear and coherent writing in which the development, organization, and style are appropriate to task, purpose, and audience

ACT Aspire PLD:

Translate moderately complex information into a table, graph, or diagram.

Compare data from two or more simple data presentations (e.g. compare a value in a table to a value in a graph or categorize data from a table using a scale from another table).

Predict the results of an additional trial or measurement in a moderately complex experiment.

Evaluate the design or methods of a simple experiment (e.g. possible flaws or inconsistencies; precision and accuracy issues).

Determine which hypothesis, prediction, or conclusion is, or is not, consistent with a moderately complex data presentation or piece of information in text.

Identify implications and assumptions in a complex theoretical model.

Science & Engineering Practices (SEP):

Using Mathematics and Computational Thinking, Developing and Using Models

Crosscutting Concepts (CCC):

Patterns, Patterns, Structure and Function

Disciplinary Core Ideas (DCI):

PS4.A: Wave Properties

Engagement:

Opening Question: “Determine the frequency of light with a wavelength of 576 nm. Research and determine the color of this light.” Discuss student responses, help as needed.

15 min

Explore:

Distribute flat mirrors and allow students time to explore the nature of the reflections in those mirrors.  They will create a description of how the light behaves to cause the reflection they see.

25 min

Explain:

Discuss the nature of flat mirrors and how the laws of reflection explain the way light behaves.

20 min

Elaborate:

Students will work practice problems related to flat mirrors. I will assist as needed.

30 min

Evaluate:

Formative as students work, summative of practice problem.

Time NA

Material/Lab Safety:

NA

Unit:

Light and Reflection

Topic:

Curved Mirrors

Lesson Objective:

Students will calculate distances and focal lengths for curved mirrors, and draw ray diagrams to find the image distances and magnification for curved mirrors.

Materials:

Curved mirrors

State Frameworks:

WO.10.P.1 Calculate the frequency and wavelength of electromagnetic radiation

WO.10.P.4 Calculate distances and focal lengths for curved mirrors

WO.10.P.5 Draw ray diagrams to find the image distance and magnification for curved mirrors

NGSS

P-PS4-1AR Use mathematical representations to support a claim regarding relationships among the frequency, wavelength, speed, and energy of waves traveling in various media. [Clarification Statement: Emphasis is on the dependence of wave speed upon media properties and the proportionality between the quantities (frequency and speed, wavelength and speed, frequency and wavelength, energy and wavelength).]

P-PS4-3AR Develop and use models to describe the interaction of light with matter. [Clarification Statement: Emphasis is on both geometric (ray diagrams) and algebraic models (mirror and thin lens equation, Snell's law).]

CCSS:

RST.11-12.3 Follow precisely a complex multistep procedure when carrying out experiments, taking measurements, or performing technical tasks; analyze the specific results based on explanations in the text.

WHST.11-12.4 Produce clear and coherent writing in which the development, organization, and style are appropriate to task, purpose, and audience

ACT Aspire PLD:

Translate moderately complex information into a table, graph, or diagram.

Compare data from two or more simple data presentations (e.g. compare a value in a table to a value in a graph or categorize data from a table using a scale from another table).

Predict the results of an additional trial or measurement in a moderately complex experiment.

Evaluate the design or methods of a simple experiment (e.g. possible flaws or inconsistencies; precision and accuracy issues).

Determine which hypothesis, prediction, or conclusion is, or is not, consistent with a moderately complex data presentation or piece of information in text.

Identify implications and assumptions in a complex theoretical model.

Science & Engineering Practices (SEP):

Using Mathematics and Computational Thinking, Developing and Using Models

Crosscutting Concepts (CCC):

Patterns, Patterns, Structure and Function

Disciplinary Core Ideas (DCI):

PS4.A: Wave Properties

Engagement:

Opening Question: “Describe the law of reflection for flat mirrors.” Discuss student responses.

5 min

Explore:

Students will take a curved mirror and explore the nature of images created by it.  They will create a real image projected on paper, and observe the virtual images created in the mirror.

20 min

Explain:

Discuss how to draw ray diagrams and how to calculate the image and object distances, focal length, and magnification for convex and concave spherical mirrors.

30 min

Elaborate:

Students will solve practice problems dealing with curved mirrors. I will assist as needed.

35 min

Evaluate:

Formative as students work, summative of practice problems.

Time NA

Material/Lab Safety:

NA