PHYSICS LESSON PLAN
ICSE Class 8 Physics Lesson Plan
Chapter: Reflection of Light – Section B
Subtopics
- Images formed in a pair of mirrors
- Number of images formed when two mirrors are inclined at an angle
- Cases:
- When 360°/angle is even
- When 360°/angle is odd- When object is placed symmetrically and asymmetrically
- Drawing ray diagrams for angle between mirrors 90°
- Images formed between parallel mirrors
- Uses of plane mirrors
- Discussion of important textbook questions and answers
Learning Outcomes
- Understand how multiple images are formed by two plane mirrors.
- Calculate the number of images using the formula N = (360°/θ) - 1.
- Differentiate between cases when 360°/θ is even and when it is odd.
- Draw ray diagrams for 90° and parallel mirror arrangements.
- Identify practical uses of plane mirrors in daily life.
Procedure
- Begin with a quick recap of the laws of reflection.
- Introduce the concept of multiple reflections using two mirrors.
- Explain how the number of images depends on the angle between mirrors using the formula N = (360°/θ) - 1.
- Discuss three cases:
- Case 1: When 360°/θ is even – the number of images is (360°/θ) - 1.
- Case 2: When 360°/θ is odd and object placed symmetrically – number of images = (360°/θ)-1
- Case 3: When object placed asymmetrically – number of images = (360°//θ )
- Demonstrate ray diagrams for 90° mirrors and parallel mirrors on the board.
- Discuss real-life applications of plane mirrors — periscopes, dressing mirrors, and optical instruments.
- Conclude with discussion and Q&A from textbook exercises.
Activities
Activity 1: Experimental Verification of Laws of Reflection .
Activity 2: Observing the Number of Images with Varying Angles
- Students use two small plane mirrors.
- They place a small object between the mirrors and vary the angle
- They observe the number of images formed in each case
Skill/Values
- Observation and practical application
- Analytical and reasoning skills
- Scientific curiosity
- Teamwork and collaboration
Assessment
- Class discussion and Q&A based on images formed by inclined mirrors
- Practical observation during both activities
- Worksheet and diagram drawing on multiple reflections
- Puzzles, flashcards, and blog-based reflection exercises