Experiment 12.3Law of Reflection

LO : To be able to carry out a practical to investigate the Law of ReflectionEnd 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)

QUIZ

Complete the sentences below :-• Light travels in a - straight line• Law of Reflection states that - angle of incidence = angle of reflection

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

Result (Follow this table for your practical)Angle of Incidence, i

(°)Angle of Reflection, r

(°)

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.

Homework/Future Learning

•Describe how a periscope works using Law of Reflection.