Physics light
2-8
Refraction and polarization of light
5. Experiment Results
A. Linearity of light
1. The light beam does go straight when we tested on the angle board.
2. As the source of light beam was getting farther away from the slit, the beam becomes narrower and shorter in addition to fading. This is because light particles escape more when they travel to go through the slit.
B. Law of reflection Angle of incidence is the angle formed by a ray incident on a surface and a perpendicular to the surface at the point of incidence. Angle of reflection is the angle between the reflected ray and the normal ray.
The bean was seen and reflected from 10~40 degrees by 10 degrees interval from left and right. In this case, the plane of incidence is made by the incidence ray and reflection ray. The reflected ray is in the incidence plane.
입사각
10
20
30
40
반사각
10
20.5
30.7
41
C. Reflection and refraction of light
입사각
10
20
30
40
굴절각
7
14
21
27
굴절율
1.42
1.41
1.39
1.41 it was solved using n= sin i / sin r. Average n = 1.41
D. Internal reflection and dispersion of light
1. ㄱ. The smooth, flat surface causes reflection from the lens. ㄴ. There exists reflection according to all the incidence angle, but it was very hard to see. But as the incidence angle got bigger and bigger it became more brighter and defined. ㄷ. Yes, the reflection ray observed in the experiment satisfies the law of reflection. ㄹ. Refraction only existed in the angle of incidence that is smaller than the critical angle. The light got sharper and brighter as the angle of incidence got smaller. ㅁ. The closer the angle of incidence is to the critical angle, the reflected light rays become sharper, while the refracted rays become more blurry. ㅂ. The critical angle is 45 degrees. The refractive index = 1/sin45 = 1.41. The experimental value is exactly the same as
Refraction and polarization of light
5. Experiment Results
A. Linearity of light
1. The light beam does go straight when we tested on the angle board.
2. As the source of light beam was getting farther away from the slit, the beam becomes narrower and shorter in addition to fading. This is because light particles escape more when they travel to go through the slit.
B. Law of reflection Angle of incidence is the angle formed by a ray incident on a surface and a perpendicular to the surface at the point of incidence. Angle of reflection is the angle between the reflected ray and the normal ray.
The bean was seen and reflected from 10~40 degrees by 10 degrees interval from left and right. In this case, the plane of incidence is made by the incidence ray and reflection ray. The reflected ray is in the incidence plane.
입사각
10
20
30
40
반사각
10
20.5
30.7
41
C. Reflection and refraction of light
입사각
10
20
30
40
굴절각
7
14
21
27
굴절율
1.42
1.41
1.39
1.41 it was solved using n= sin i / sin r. Average n = 1.41
D. Internal reflection and dispersion of light
1. ㄱ. The smooth, flat surface causes reflection from the lens. ㄴ. There exists reflection according to all the incidence angle, but it was very hard to see. But as the incidence angle got bigger and bigger it became more brighter and defined. ㄷ. Yes, the reflection ray observed in the experiment satisfies the law of reflection. ㄹ. Refraction only existed in the angle of incidence that is smaller than the critical angle. The light got sharper and brighter as the angle of incidence got smaller. ㅁ. The closer the angle of incidence is to the critical angle, the reflected light rays become sharper, while the refracted rays become more blurry. ㅂ. The critical angle is 45 degrees. The refractive index = 1/sin45 = 1.41. The experimental value is exactly the same as