Physics - Senior Secondary 2 - Light waves

Light waves

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TERM: 1ST TERM

WEEK: 11

Class: Senior Secondary School 2
Age: 16 years
Duration: 40 minutes for each of 5 periods
Date:
Subject: Physics
Topic: Light Waves
Subtopics:
• Dispersion of white light
• Refraction of light through converging and diverging lenses
• Images formed by lenses

SPECIFIC OBJECTIVES:
By the end of the lesson, students should be able to:

  1. Explain the dispersion of white light and its significance in the study of light.
  2. Identify the differences between converging and diverging lenses and their uses.
  3. Understand how images are formed by lenses and the relationship between object distance, image distance, and focal length.
  4. Verify the lens formula through practical activities.

INSTRUCTIONAL TECHNIQUES:
• Explanation
• Demonstration
• Questions and answers
• Hands-on activity: Verification of the lens formula
• Group work: Investigation of dispersion of white light

INSTRUCTIONAL MATERIALS:
• Triangular glass prism
• Converging and diverging lenses
• Light sources
• Whiteboard markers
• Physics textbook
• Videos on dispersion of light

INSTRUCTIONAL PROCEDURES
PERIOD 1-5

PRESENTATION

STEP 1: INTRODUCTION
• The teacher introduces the concept of white light and its components.
• Students are asked to recall what they know about the behavior of light when passing through a prism.

STEP 2: EXPLANATION
• The teacher explains the phenomenon of dispersion, where white light splits into its constituent colors when passed through a triangular glass prism.
• The teacher explains the difference between converging and diverging lenses and how they affect light.
• Discussion of the lens formula: 1/f = 1/v - 1/u, where f is the focal length, v is the image distance, and u is the object distance.

STEP 3: DEMONSTRATION
• The teacher demonstrates the dispersion of white light through a triangular glass prism, showing the visible spectrum of colors.
• The teacher also demonstrates how converging and diverging lenses form images.

STEP 4: ACTIVITY
• Students will verify the lens formula by performing experiments with converging and diverging lenses.
• Students will use light sources and measure object distances and image distances to verify the lens formula.

STEP 5: NOTE TAKING
• The teacher summarizes the lesson on the board:

  • Dispersion of White Light: White light is made up of a spectrum of colors, which can be separated when passed through a prism.
  • Lens Formula: The relationship between the focal length (f), object distance (u), and image distance (v) is given by 1/f = 1/v - 1/u.

EVALUATION

  1. What is dispersion, and how does it occur?
  2. What are converging and diverging lenses?
  3. How is the lens formula used to calculate image and object distances?

CLASSWORK:
• Use a converging lens to form an image and calculate the focal length.
• Explain the process of dispersion using a triangular glass prism.

CONCLUSION:
• Review the students’ work and provide feedback.
• Encourage students to explore the applications of lenses in everyday life.