Page
  1. 1
    1
  2. 2
    2
  3. 3
    3

Refraction of Light Lab Report

Extracts from this essay...

Introduction

David Urlanda Physics Lab Report Refraction of Light - Air into Glass Purpose: When light travels through different mediums, it is being refracted. The purpose of this lab is to test Snell's law of refraction. Hypothesis: The angles of refraction that I predicted from the angle of incidences by using Snell's Law are below on the predicted angle Column. To obtain these values I used the index of refraction of crown glass because it is more likely close to the glass (plexiglass) that we are using. Angle of Incidence 0° 10° 20° 30° 40° 50° 60° Predicted angle of refraction 0 6.56° 13.0° 19.2° 25.02° 30.27° 34.74° Variables and Controls: Independent Variable: The angle of the light coming from the ray box or the angle of incidence Dependent Variable: The angle of refraction on the plexiglass. Controls: The mediums where light travels (air and plexiglass). Materials: - ray box - plexiglass - white paper, protractor and pencil Procedure: 1.

Middle

- I placed the paper and the flexi glass on the center of lab bench so that the ray box or the glass would not fall during the entire investigation. - I moved and held the ray box cautiously. Observations: Qualitative Observations: - The light coming from the ray bow was bent toward the normal. - The light from the ray box were not that thin as the lines I drawn. Quantitative Observations: Angle of Incidence (°) (?i) Predicted angle of refraction (°) (?r) Measured angle of refraction (°) (?r) Difference Sin?i/ sin?r 0 0 0 0 0 10 6.56 8 1.44 1.25 20 13.0 14 1 1.41 30 19.2 20 0.8 1.46 40 25.02 26 0.98 1.47 50 30.27 32 1.73 1.45 60 37.74 35 0.26 1.51 * the actual observation is attached on the last page. Sample Calculations: n1 sin?1 =n2 sin?2 difference n1= 1.0003 8° - 6.56 ° = 1.44 sin?1= 10° n2 = 1.52 Sin?i/ sin?r sin?2 =?

Conclusion

If this maybe happens, it will result to inaccurate value. In able to avoid this, make sure that when marking the refracted light should be the center of the ray. - Another source of error that probably occurred is the incorrect measure of the angle the light from the ray box or the angle of incidence, if the angle of incidence is not accurate it will not corresponds on the expected angle of refraction. Conclusion: Snell's law states that the sine angle of incidence is directly proportional to the sine angle of refraction. We can see in my data that this law is true. As the angle of incidence increase the angle of refraction also increases. There might be a little bit difference with my predicted and measured angle of refraction, probably it's because I used the index of refraction of crown glass, where crown glass is more optically denser than plexiglass. As I researched the index of refraction, according to wikipedia the index is 1.4893-1.4899. If I use this value I would actually get a closer value.

The above preview is unformatted text

Found what you're looking for?

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

Not the one? Search for your essay title...
  • Over 180,000 student essays
  • Every subject and level covered
  • Thousands of essays marked by teachers

Related AS and A Level Microscopes & Lenses

  1. My experiments focus is to obtain an accurate measurement for a specific lenss power.

    61 D. This results in an average of 6.555+/- 0.055 D. This uncertainty is larger than the first experiment (0.02D); yet smaller than the second (0.125D). Percentage wise it is also larger than the first experiment and smaller than the second: (0.0555/6.555)x100= 0.839% in comparison to 0.309% and 1.94% respectively.

  2. An investigation into the workings of the opticians

    The retina also contains 'rods and cones' and is responsible for our peripheral vision as it is not the area that light is focused onto but light still hits it. The iris is responsible for controlling the amount of light entering the eye so as to prevent damage to the macula and retina.

  • Over 180,000 essays
    written by students
  • Annotated by
    experienced teachers
  • Ideas and feedback to write
    your own great essays

Marked by a teacher

This essay has been marked by one of our great teachers. You can read the full teachers notes when you download the essay.

Peer reviewed

This essay has been reviewed by one of our specialist student essay reviewing squad. Read the full review on the essay page.

Peer reviewed

This essay has been reviewed by one of our specialist student essay reviewing squad. Read the full review under the essay preview on this page.