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I have just conducted the experimental stage of a practical 'to find the refractive index of different objects using Snell’s law' (which states sine i/sine r =N). The objects chosen were Ice, Glass, and Perspex. As 3 trials were taken for all 3 objects, if these points were graphed, and a line of best fit was applied, I believe the gradient of this line would be the refractive index? Is this correct? Also does the I and R angles of the light leaving the prism hold any significance?

attached are my results.

RESULTS / DATA:

Perspex

I1 R1 N1 I2 R2 N2

40 25 -5.63 25 38.5 -0.18

10 8.5 -0.68 8.5 11.5 -0.91

29 20.5 -0.67 20.5 30 -1.01

Glass

I1 R1 N1 I2 R2 N2

22.5 13.5 -0.61 12.5 22.5 0.14

30.5 30 0.80 20 32.5 1.03

20 14 0.92 14 25 -7.48

Ice

I1 R1 N1 I2 R2 N2

22 31 0.02 30 34 -1.87

23 19 -5.65 19 24 -0.17

2 1.5 0.91 1.5 2 1.10

Note - The 1 results were those angles entering the prism, while the 2 results were those angles of the light leaving the prism.

cheers

matt

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# Homework Help: Find the refractive index of different objects using Snell’s law

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