answer-246

Light

Question	Answer	Extra information
1	Random. [1 mark]	Not an acceptable answer: human error.
2	Accept any practical sugestion that could cause a range of values eg. misjudging the centre of the ray OR not replacing mirror / ray box in the same position. [1 mark]	Not an acceptable answer: measuring the angle incorrectly is insufficient moving the mirror / ray box
3	range = 10 OR mean of 51 calculated. [1 mark] 5╦Ü [1 mark]
4	Within experimental accuracy the angle of incidence and the angle of reflection are the same OR the angle of reflection is usually different to the angle of incidence. [1 mark] Relevant use of data eg at 20╦Ü / 30╦Ü / 40╦Ü there is at least one measurement of angle of reflection that is exactly the same OR at 50╦Ü there are big differences. [1 mark]
5	Results could be collected for angles (of incidence) not yet measured [1 mark]	Not an acceptable answer: changing the mirror.
6	Replace the mirror with an irregular reflecting surface [1 mark]	Not an acceptable answer: replace mirror with paper.