Experiment to investigate the blind spot

* I predict that the greater distance between the cross and the dot the further away it will disappear. I have made my hypothesis from the text book.

* I intend to use a metre ruler, and a blind spot meter.

* To make my test fair I am using the same metre ruler, the same metre and the same eye.

* I believe that is metre ruler is very accurate and the metre is good but is made out of paper so is quite bendy. Also my focus and concentration could lapse so the experiment should have my full attention.

* There are no safety measures in my experiment.

Observations

* Firstly I made the blind spot metre by tracing the shape of the metre and cutting them out.

* Then I cut a slit in it.

* I slipped flap A through Slit B so that I could still see the cross and the dot.

* I measured the distance between the cross and the dot and used a paper clip to hold it in that place.

* I put the cross on the right hand side in front of me and closed my right eye.

* Then looking only at the cross I moved the metre until the dot disappeared out of the corner of my eye.

* Then a partner measured the distance between the bridge of my nose and the metre.

* I repeated the results a few times changing the distance between the cross and the dot and recorded my results in the table below.

Cm Between Cross and Dot

Cm Away From Bridge of Nose

5

14

6

20

7

23

8

28

9

31

10

35

11

37

12

41

13

44

14

47

15

49

Analysis

See Graph.

I have found out that my prediction was correct.

There is a pattern that, the greater the distance between the cross and dot, the greater the distance away from the bridge of the nose that the dot disappears.

Evaluation

I think that my result6s were quite accurate but could have been more accurate if the blind spot metre was made out of card so that it didn’t bend.

Luckily all the results fitted the pattern.

If I was to do the experiment again I would make the blind spot metre out of card.