![]() ![]() When the angle of incidence reaches a certain value, called the critical angle, the angle of refraction is 90°. As the angle of incidence increases, the angle of refraction also increases. "Total Internal Reflection When light passes from a medium of large refractive index into one of small refractive index - for example, from water to air - the refracted ray bends away from the surface normal, as shown in Fig. by (2) n sine, = n, sine Equation (2) is known as Snell's law. The angle of refractions, is related to the angle of incidence 0. Snell's Law of Refraction When light travels from a material with refractive index ne into a material with refractive index rs, the refracted ray, the incident ray, and the surface normal to the interface between the materials all lie in the same plane. The ray that enters the second material is a said to be refracted Figure 1 Light reflection & refraction 2. If the incident ray does not strike the interface at normal refracted may incidence, the transmitted ray has a different direction than reflected ray the incident ray. The remainder is transmitted across the interface. Part of the light is reflected, with the angle of reflection equaling the angle of incidence. Law of Reflection The incident ray, the reflected ray, and the surface normal all lic in the same plane, called the plane of incidence, and the angle of reflection, equals the angle of incidence =0, (1) When light strikes the interface between two transparent incident ray materials, such as air and water, the light generally divides into two parts, as Fig. The Law of reflection describes the behavior of the incident and reflected rays. The angle of reflection 0, is the angle that the reflected ray makes with the surface normal. 1, the angle of incidence 6, is the angle that the incident ray makes with respect to the surface normal, a line drawn perpendicular to the surface at the point of incidence. Suppose a ray of light is incident on a flat surface as shown in Fig. Theory Most objects reflect a certain portion of the light falling on them. Equipment Ray optics kit (OS-8516), light source (OS-8517) with power supply, ruler (30 cm), white papers, (RT-100N)reading Demonstrations: Miracle mirror, Illusion scope, Teata reflection including (a) Optic path (plastic bar), (b) Porro prism, (c) Optic-fiber bundles, (d) Total internal reflection tank. Measure focal lengths of convex and concave mirrors. Study physics laws of reflection, refraction and total internal reflection, 2. Transcribed image text: Experiment 9 Reflection, refraction and total internal reflection Purpose 1. ![]()
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