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

To determine the refractive index of glass

Extracts from this document...

Introduction

 PHYSICS COURSEWORK LAB REPORT

Aim: To determine the refractive index of glass.

Hypothesis: The incident ray, the normal and the refracted ray all lie in the same plane. Also, according to Snell’s law, for 2 particular media, the ratio of the sine of the angle of incidence to the sine of the angle of refraction should be a constant:  

Sin iimage00.pngimage01.png

Sin rimage02.png

Apparatus:

  1. A rectangular prism
  2. Four 1 inch pins
...read more.

Middle

The rectangular prism is placed at the middle of the top of the page and its perimeter is traced with the help of the ruler and pencil. The normal is soon after marked out in the approximate centre of the perimeter using the protractor at the 90 degrees point.  The operation is then repeated at the middle of the bottom of the page and finally to the back of the page.4 perimeters with a normal on each should already be drawn at that stage. Next, an angle should be measured and traced from the point where the normal touches the perimeter line from any of the 4 sketch. The angle is noted at the table as an angle of incidence.
...read more.

Conclusion

image04.png

    Results                

image05.png

Conclusion

The results seem satisfying enough to support the hypothesis, hence supporting the idea of the law of refraction.

Evaluation and precautions

  • Blue tack was used so as to keep the paper stable while working to prevent errors.
  • A double check with another protractor was performed to ensure its accuracy.
  • Mistakes such as not perfectly vertical pins stuck or not exactly parallel positioning of the eye could have been performed relying on the results.
  • Parallax errors or other mistakes such as too bumpy cardboard may have lead to not accurate enough results.
  • Another method of performing the experiment yet roughly the same precision would be to use light beams which would be more accurate than our eyes’ positioning therefore reducing parallax error.

...read more.

This student written piece of work is one of many that can be found in our GCSE The Earth and Beyond section.

Found what you're looking for?

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

Here's what a star student thought of this essay

4 star(s)

Response to the question

The candidate has planned and carried out an investigation into Snell's Law. They have measured the angles or incidence and refraction of beams of light through a glass block, and used their data to support their conclusion that Snell's Law ...

Read full review

Response to the question

The candidate has planned and carried out an investigation into Snell's Law. They have measured the angles or incidence and refraction of beams of light through a glass block, and used their data to support their conclusion that Snell's Law is true. They have included hypothesis, method, results, conclusion, and evaluation sections. However, they could have gone into more detail in some areas, such as the suggestions for improvement in the evaluation section. However, they have still managed to carry out the experiment well and therefore come to a well supported conclusion.

Level of analysis

The candidate has manipulated their results well by using mathematical functions, including the sine function. However, they have made the common error of giving their results of their calculations to a higher degree of accuracy than their original data - it would have been better to record the angles to two significant figures (not just in increments of 5 degrees) in order to improve the accuracy of their results. They could also have improved their analysis by including a graph - for example a graph of the sine of the angle of incidence to the sine of the angle of refraction.
They have considered the possible causes of error in their data in their evaluation section, along with suggestions for improvement, although they could have described these a bit more clearly.
Overall, their excellent mathematical manipulation of the original data should have gained them good marks, and they should only have been slightly held back by these small issues.

Quality of writing

Their spelling, grammar, and punctuation is excellent throughout. They have generally explained and described things clearly, but their method section in particular could have been improved by a labelled diagram. The report is organised well into well-titled sections, the only noticeable issue here is the lack of a 'reducing uncertainties/ errors' section, which is an essential part of the method. However, much of the information which should have been here has been included in the evaluation.


Did you find this review helpful? Join our team of reviewers and help other students learn

Reviewed by dragonkeeper13 18/07/2012

Read less
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 The Earth and Beyond essays

  1. Marked by a teacher

    'Sheenagh Pugh presents us with a Sad View of the Future and a Grim ...

    4 star(s)

    The poem starts with in a very sad atmosphere, the poem is very sad and pessimistic, an example of this is 'you won't see what it was; what it could be.', from line 7. The poem is set out in a free-flowing verse, consisting of 28 lines.

  2. Free essay

    Physics Research and Report - What is Antimatter?

    3 star(s)

    This achieves high amounts of energy and allows probing to even smaller scales of particles, leading to research on the beginning of the universe.

  1. The Extinction of the Dinosaurs - reviewing 3 theories.

    The theory states that the eruptions would have huge effects on the environment, for starters burying most of West-India in nearly 12,000 feet of rock. It is thought that the massive waves combined with the quick change in climate would have killed the dinosaurs.

  2. Journey To The Centre Of The Earth - The Accuracies and Inaccuracies - Chapter ...

    km below and the surface plates and crust of the Earth would be very unstable on top of the fictional violent magma. Looking at global averages for thermal gradients, from deep mines or boreholes, 35�C/Km is a more likely estimate.

  1. A consideration of Lord of the Rings: Fellowship of the Ring, and Star Wars: ...

    At times it feels as if the commercial aspect of the film interferes with the story telling. The film feels as though it has been tailored to fit audiences and diluted to fit the U certificate. most of star wars was filmed in a studio, and because Tolkein (books author)

  2. Victorian Press and the Working Classes

    In another way can be hard to create the balanced view, as the same story may not be printed from in both newspapers at all. It is also important to decide on the relevance of the story. A story about the taking of Jansi, Indiai can be considered important, as

  1. Media Course work: The Times and The Daily Star's Coverage of the Ian Huntley ...

    The picture takes up nearly the whole of the first page and aims at grabbing the readers' attention, as it is shocking to cheat on your partner in public. The idea behind this it that 100% of readers read the headline and see the photograph so if the paper can hold the readers' attention then the paper might be purchased.

  2. Planning for Lunar Observations Coursework

    still being useful for safety will taking/going to an appropriate observation site. Another piece of equipment I will be using is a clipboard. This while be needed when I take my observations to take draw a clear replica of the moon.

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