Class 7 Physics Lesson Plan - Chapter 4: Light Energy

Class 7 Physics Lesson Plan

Chapter 4: Light Energy

Subtopics

  • Reflection and Laws of Reflection
  • Speed of Light [3 × 108 m/s]
  • Plane Mirror
  • Primary Colours (RGB - Red, Green, Blue)
  • Formation of Secondary Colours by Colour Addition
  • Appearance of Colour of an Object (Based on Absorption and Reflection)

Learning Objectives

  • Understand the laws of reflection and how light behaves when it strikes a surface.
  • Recognize the speed of light and its importance in physics.
  • Learn about plane mirrors and their characteristics.
  • Identify primary colours and how they mix to form secondary colours.
  • Analyze how objects appear in different colours due to reflection and absorption of light.

Procedure

  • Introduce the concept of reflection and demonstrate with a mirror.
  • Explain the speed of light and its role in optical phenomena.
  • Discuss plane mirrors and their properties using practical examples.
  • Demonstrate the primary colours (RGB) using a light source.
  • Show how secondary colours are formed through colour addition.
  • Explain why objects appear in different colours based on light absorption and reflection.

Activities

  • Experiment: Use a laser pointer and a mirror to demonstrate reflection.
  • Group discussion on real-life applications of reflection (periscopes, rearview mirrors).
  • Practical: Mixing coloured light using a projector or LED sources.
  • Observation: Identifying colours of different objects under different lights.

Skill/Values

  • Scientific observation and reasoning.
  • Analytical thinking in optics.
  • Application of physics in daily life.
  • Creativity in understanding colours and light.

Assessment

  • Class discussion and Q&A sessions.
  • Worksheet on reflection, speed of light, and colour formation.
  • Practical experiments on mirror reflection and colour mixing.
  • Quiz on laws of reflection and primary colours.