Physics 2 Lab 7 PDF

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Physics 2 Lab 7...

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Refraction of Light 11/10/17 Conor Gugliotta, Kenneth, Ashleigh, & Thomas

Purpose: The purpose of this experiment is to use Snell’s Law to determine the index of refraction of glass and water. Introduction: Refraction is the change in direction of a light ray as it passes from one medium to the second medium. This medium for example can be air to glass. Light will be reflected from pin A. The light as it passes from air to glass changes direction. When the three pins, A, B, & C are viewed through the glass they will appear to be aligned. The change in direction of the light is what will be measured. 

n1 sinθ1 = n2 sinθ2

Data Analysis: θ1 15° 20° 25° 30° 35° 40° 45°

θ2 (Glass) 11° 14° 17° 20° 23° 25.5° 29°

θ1 15° 20° 25° 30° 35° 40°

θ2 (Water) 11.7° 15° 19° 23° 27° 30.5°

45°

34°

θ1 sin15 (0.2588) sin20 (0.342) sin25 (0.4226) sin30 (0.5) sin35 (0.5736) sin40 (0.6428) sin45 (0.7071)

θ2 (Glass) 0.1908 0.2419 0.2924 0.342 0.3907 0.4305 0.4848

θ2 (Water) 0.2027 0.2588 0.3256 0.3907 0.4539 0.507 0.559

Sketch:

Snell's Law for Glass 0.8 0.7

f(x) = 1.49 x − 0.01

0.6

Air

0.5 0.4 0.3 0.2 0.1 0

0

0.1

0.2

0.3

Glass

0.4

0.5

0.6

Snell's Law for Water 0.8 0.7

f(x) = 1.26 x + 0.01

0.6

Air

0.5 0.4 0.3 0.2 0.1 0

0

0.1

0.2

0.3

Water



Glass Refraction Index o y = 1.489x + 0.0108 o n2 = 1.489



Water Refraction Index o y = 1.2602x + 0.0059 o n2 = 1.260



Examples o Air 

sinθ1 = sin(45°) = 0.7071

o Glass 

sinθ2 = sin(23°) = 0.3907

o Water 

sinθ2 = sin(34°) = 0.559

0.4

0.5

0.6...