Determine the refractive index of glass

Hypothesis The incident ray, the modal(prenominal) and the refracted ray all lie in the same plane. Also, fit in to Snells 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 constantSin iSin rApparatus1. A rectangular prism2. Four 1 inch pins3. A protractor4. A ruler5. An A4 size unlifelike6. An A4 size winding-sheet of plain paper7. 4 bits of blue tack8. A pencilMethod1. A evade is drawn at the top left side of the A4 size paper with column titles Angle of relative incidence and Angle of Refraction. The table should contain 8 rows excluding the column titles.2. The rectangular prism is laid at the middle of the top of the page and its perimeter is traced with the help of the ruler and pencil. The dominion is soon after tag out in the approximate centre of the perimeter utilise the protractor at the 90 degrees tip. The operation is and so repeated at the middle of the bottom of the page and fina lly to the back of the page.3. 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. This step is repeated five more times with different angles each time.4. The page is placed on the piece of cardboard and stabilised using the blue tack bits.5. 2 pins are stuck on any incident lines and the rectangular prism in placed fitting the perimeter marked previously.6. The pins should be observed at a parallel and opposite side of the rectangular prism and the cardboard should be moved so that 1pin covers the other totally and 2 more pins should be stuck.7. The pins are removed in concert with the page and a line is drawn from the 2 recent holes caused by the pins.8. A new normal is outlined out of the new line and the angle is measured and noted as the emergent ray.9. A line is drawn f rom the emergent ray to the incident ray and the angle from the normal is measured using the protractor.10. Steps 4 to 8 are repeated 7 more times varying on the 4 perimeters.11. The page should resemble the followingResultsConclusionThe results seem satisfying enough to support the hypothesis, thereof supporting the idea of the law of refraction.Evaluation and precautions* Blue tack was used so as to maintenance the paper stable while working to prevent errors.* A double check with another protractor was performed to see its accuracy.* Mistakes such as not perfectly vertical pins stuck or not exactly parallel locating 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 immaculate 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.