• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Compare the measured refractive index of three liquids against the unknown values and to then use the technique to measure the refractive of an unknown liquid.

Extracts from this document...

Introduction

Charlie Hyde 11C

Compare the measured refractive index of three liquids against the unknown values and to then use the technique to measure the refractive of an unknown liquid.

Diagram

Pilot

A pilot experiment was carried out, using a Perspex block.  The block was placed onto a piece of paper and drawn around to ensure that the block remained in the same place throughout the entire duration of the experiment. The normal was also drawn and from this, five different angles of incidence were drawn. These were placed at 10,20,30,40 and 50.  At each angle of incidence a ray of light was shone and the light that entered and exited the Perspex block was noted and the angle of refraction measured.

Method

Refraction is caused by the change in speed of light when it passes into a medium that has a different optical density to air or the medium through which it is passing.

A Perspex tank will be placed on a piece of paper and drawn around. Then the shape will be cut out. The tank will then stay in this position. The tank will be filled around 2/3 full of liquid.

...read more.

Middle

30°

21°

0.50

0.36

1.3

40°

29°

0.64

0.48

1.3

50°

40°

0.77

0.64

1.2

60°

41°

0.87

0.66

1.3

Oil

Angle of incidence (I)

Angle of refraction (R)

Sin I

Sin R

Refractive index (R.I)

Sin I

Sin R

10°

0.17°

0.10°

1.70

20°

12.5°

0.34°

0.22°

1.55

30°

20°

0.50°

0.34°

1.47

40°

27°

0.64°

0.45°

1.42

50°

32°

0.77°

0.53°

1.45

60°

36°

0.87°

0.59°

1.47

Ethanol

Angle of incidence

(I)

Angle of refraction

(R)

Sin I

...read more.

Conclusion

When testing ethanol, two beams of light could be seen on the paper because some light went over the shutter in the ray box.  So it was not necessarily clear as to which one was the correct angle of refraction.  Despite this, accurate results seem to have been obtained.

The experiment was reliable enough to complete the investigation safely, fairly and accurately.  It was an easy way of succeeding in finding out what was needed to be investigated.

However, although in the plan it said that each experiment was going to be repeated to check for errors and therefore make the results more accurate, there was not enough time to do so. So if there was an opportunity to do this investigation again, each experiment for each of the three liquids would be repeated. This would mean that an average could be taken and so the results would be even more accurate. 

To take the investigation even further, it could be done in slightly different circumstances. The liquids could be poured into a different shaped tray, or a tray made out of thicker plastic, or the liquids could be a different temperature. This would then give a larger range of results, by showing how the refractive index changes under different circumstances.

Mr Strange        Physics Coursework        

...read more.

This student written piece of work is one of many that can be found in our GCSE Waves section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related GCSE Waves essays

  1. Marked by a teacher

    Find the critical angle and refractive index for plastic using a graphical treatment for ...

    4 star(s)

    I will do this so the points become positively correlated and can have a line of best fit placed through them. I will use the line of best fit to check any anomalies and find the Sine R value of 1 (900).

  2. Marked by a teacher

    Resonance of a Wine Glass

    3 star(s)

    My prediction was correct. Analysis To ascertain how much possibility there was of this being a straight line. I have used a statistical method to analyse correlation. This involves taking the x and y values and formulating them into and equation which shows the strength of a correlation.5 Unfortunately I

  1. The aim of my experiment is to see what factors affect electromagnetism the most ...

    When looking at the bars the less space between the value of the variable and the mass of the paperclips the better, because less energy is being expended to get more mass of paperclips, and the variable with the least space between itself and the mass of the paperclips was the current.

  2. Investigating the factors which affect the sideways displacement of a light ray through a ...

    * I could use a bigger protractor with a larger scale, which would make my angle measuring more precise. * I could also take a reading for every 5 degrees angle of incidence, which would make my results more exact and reliable.

  1. Refractrometry. Aim: Using a model Pulfrich refractometer determine the refractive index of a range ...

    For example I will be using black paper to make visibility of the disappearance easier to spot. I must ensure that I use a sharp pencil so that my measurements are precise. By using the pins and pin board system I can take time to check my measurements are correct before drawing in the lines.

  2. Find a relationship between the angles of incidence and the angles of refraction by ...

    Remove the perspex block and draw lines to mark each refracted ray. 6) Measure the angles of refraction with the protractor and record them onto the Results Table provided. 7) Do so for the rest of the Results Table.

  1. Deviation of Light by a Prism.

    Prediction Until I actually commence with my calculations to see how the angles vary compared to one another, I can offer no prediction based on initial knowledge, as my knowledge what happens to light in a prism, and how the angles change with respect to one another is limited.

  2. Light is so common that we often take it for granted.

    A simple model of a light wave begins with a ray (a straight line) that shows the direction of the light's travel. Along the ray and perpendicular (at right angles) to it, short arrows represent the electric field. Some arrows point upward from the ray and other arrows point downward from it.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work