Experiment 12.3
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Experiment 12.3 investigates the Law of Reflection. The objectives are to compare the angle of incidence and angle of reflection of a light beam, describe reflection at a plane surface using the Law of Reflection, and develop skills in accurate measurement and evaluation. The procedure involves directing a light ray at a mirror at various angles of incidence and measuring the corresponding angles of reflection. The results are recorded in a table. The discussion analyzes whether the data verifies the Law of Reflection and possible sources of error. The homework asks students to describe how a periscope works using the Law of Reflection.
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Experiment 12.3
- 1. Experiment 12.3 Law of Reflection
- 2. LO : To be able to carry out a practical to investigate the Law of Reflection End of the experiment :- I can compare the angle of incidence of a light beam with its angle of reflection (L5) I can describe reflection at a plane and use the Law of Reflection (L6) I can develop skills in measuring accurately and evaluate my practical (L7)
- 3. QUIZ Complete the sentences below :- • Light travels in a - straight line • Law of Reflection states that - angle of incidence = angle of reflection
- 4. Procedure • Draw a line on a blank piece of paper • Place the back surface of the mirror onto the line • Using a light box, direct a single light ray at an angle towards the mirror • Draw two small dots along each light ray • Remove the light box and the mirror • Using a ruler, connect the dots with straight lines • Using a protractor, draw in a normal and measure and record the angle of incidence and angle of reflection
- 5. Result (Follow this table for your practical) Angle of Incidence, i (°) Angle of Reflection, r (°)
- 6. Discussion • State whether the data seems to verify the law of reflection (angle of incidence equals angle of reflection within reasonable limits of error). • What characteristic validates the law of reflection? • Possible sources of error in the experimental results.
- 7. Homework/Future Learning • Describe how a periscope works using Law of Reflection.