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# Investigating the Relationship Between Real and Apparent Depth.

Extracts from this document...

Introduction

Physics Coursework        Tom Dennis

Investigating the Relationship Between Real and Apparent Depth

Introduction:

In this coursework I am going to measure the real and apparent distance of an optical pin placed behind glass blocks. To do this I got two glass blocks and stuck a pin at the end of one of the glass blocks and then placed a drawing pin on to the glass blocks and then moved the drawing pin around to get the apparent depth and the real depth was the length from the pin to the end of the glass blocks. I made a diagram to clearly show how the apparatus was assembled. The apparatus and the way in which I conducted the experiment looks like the diagram below.

The apparatus that we used was as follows:

2 x Glass blocks

1 x Drawing pin

1 x Optical Pin

Cellar Tape

1 x Wooden Board

## Method

To make the experiment successful I made sure the safety factors were taken into account, the experiment was very safe as there was no real danger that could be inflicted

Middle

### Refractive Index = Speed of Light in Air/ Speed of Light in Material

As soon as I collected my data I recorded them in a neat table to make sure the results were recorded correctly.

I took 7 readings altogether, 7 readings are plenty of results to achieve a high level of reliability.

My table of results that I collected are as below. As I did two sets of apparent depth it shows clearly that my results are reliable.

 Real Depth (cm) Apparent Depth 1 (cm) Apparent Depth 2 (cm) Average Apparent depth (cm) 6.3 4.7 4.6 4.65 7.8 5.7 5.5 5.6 11 7.5 7.2 7.35 12.8 8.3 8.4 8.35 13.1 9.5 9.3 9.4 17.9 11.7 11.4 11.55 22.8 15.6 15.6 15.6

Conclusion

d and therefore my experiment was successful. To get a better look in to the investigation I decided to work out refractive index as well to be able to show my results more clearly.

My results for refractive index are as follows.

 Position Real Depth (cm) Apparent Depth (cm) Refractive Index (cm) 1 6.3 4.65 1.35 2 7.8 5.6 1.39 3 11 7.35 1.5 4 12.8 8.35 1.53 5 13.1 9.4 1.4 6 17.9 11.55 1.55 7 22.8 15.6 1.46

## Evaluation

As I did the experiment continuously until I got the readings that were reliable then I cant say that the results weren’t reliable, and so I can only come up with one possible way to make the experiment better and more reliable. As I used my eyesight to do this the one error I can come up with is human error, because I used my eyesight then this could have altered my results, to make this better I could have used a lazer beam as this would have made my results much more accurate. Also I could have used a ruler that was more precise to make my readings even better. My prediction was proved right, to sum up my experiment I would say it was successful as I managed to gather some good results that proved my prediction.

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