User interface of snells law working on the simulated experiment. See how changing from air to water to glass changes the bending angle. Snells law, in optics, a relationship between the path taken by a ray of light in crossing the boundary or surface of separation between two contacting substances and the refractive index of each. The second graph verified snell s law in the same way. This law also applies to the bending of light by lenses and to the guiding of light by the fiber optic cables that carry modern communications signals. Homework statement b a student wants to find the refractive index of a rectangular block of glass. Light is an electromagnetic disturbance and, as such, is described using maxwell s equations. This paper gives a focussed summary of good practice taken primarily from engineers who. Snells law students use an optics ray table to measure the incident and refraction angles of a light ray traveling from air into a material with unknown index of refraction, and then, using the principles of refraction and snells law, they determine the materials index of refraction.
Full text of physics 11, snell s law experiment see other formats physics experiment 6 snell s law purpose. Students experimentally derive the law of reflection for curved and flat mirrors. Average the three values of the index of refraction. Snell s law is explored and the index of refraction for a piece of acrylic material is found. Deduce whether the index of refraction for a material is a constant. Laws of reflection and snells law revisited by video modeling. Looking at snells law, we can see the relationship between index of refraction and the angle of refraction. Snells law lab report snells law lab christie fosina. To use snell s law to determine the index of refraction n of a piece of glass and to use it to find the speed of light in that glass procedure. Conclusion the goal of this experiment was to verify. A ray is a line that has an origin but does not have an end. This reinforces the connection between the real rays they can see in the lab and the type of ray diagrams seen in the classroom. Determination of the refractive index of a glass block using law target. Snell s law lab christie fosina 43014 physics regents mrs.
Snells law is defined as the ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant, for the light of a given colour and for the given pair of media. In this experiment you will measure the refraction of light as it passes from one medium to. Video modelling can be done with a free analyser software available for. While you may not think that these ideas have anything to do with. Play with prisms of different shapes and make rainbows. Laser level, protractor, plate glass, plain paper, pencil. What happens when light travels from one medium to another, like from air to water. I measured the angle of incidence for water which was 45 degrees. This lab covers the thin lens equation, snell s law, and the lens makers equation. Snells law is a formula used to describe the relationship between the angles of incidence and. Ryan ivey focuses his practice in the life sciences industry.
A physics 11 experiment on refraction and snell s law. Refraction and snells law by ariela schear on prezi. The website offers a template for vernier softwares graphical analysis 3. He draws around the block and marks the position of a ray of light that travels through. State university affordable learning solutions program, and merlot. Snells law advanced placement lab experiments pasco. This paper gives a detailed account of a novel way in physics in which distance learning s. As you have seen, the direction of light propagation changes abruptly when light encounters a reflective. The law of refraction or snells law describes the amount of refraction which will. Snell s law also known as snell descartes law and the law of refraction is a formula used to describe the relationship between the angles of incidence and refraction, when referring to light or other waves. The answer can be described by snell s law, which is the main focus of this lesson. Determination of the refractive index of a glass block.
This video explains how to perform the snell s law lab. Physics 4 laboratory snells law, lenses, and optical. The bending of a light ray as it passes from air to water is determined by snells law. When light passed from air into a denser medium, the. Snells law is explored and the index of refraction for a piece of acrylic material is found. Snells law northwestern undergraduate physics labs.
In 1621, willebrord snell discovered the law of refraction, hence called snells law. In this and the following lab the light is viewed as a ray. Geometric optics snc2de snells law formal lab prelab 20 marks. Students trace the rays on the provided templates and make angle measurements directly from their drawing. Answer the following questions as preparation for the lab and include it in the appendix of your lab report. Investigating snells law investigating snells law research question. Snell s law like with reflection, refraction also involves the angles that the incident ray and the. Using the graphical analysis software plot a graph of sin. When light travels through a vacuum or a dilute gas such as air, it does. Description use ray diagrams to model the refraction of light from air into glass. Phy pack 4 refractive index law 2 produced by physics group, university of cape coast, as part of a delphe funded project title.
When light travels through a vacuum or a dilute gas such as air, it does so at the incredible speed of cvac3. Snells law students use an optics ray table to measure the incident and refraction angles of a light ray traveling from air into a material with unknown index of refraction, and then, using the principles of refraction and snells law. This document includes several ray tracings which can be used by students to do a takehome lab. Physics 4 laboratory snells law, lenses, and optical instruments prelab exercise please read the procedure section and try to understand the physics involved and how the experimental procedure. Wave refraction, simon lees, hs, hw guided lab, physics. To use snells law to mathematically analyze situations involving the.
You will investigate fiber optics and light pipes and you will gain an elementary understanding of how lenticular lenses can be used to simulate 3d images, image motion, image morphing, etc. The law of refraction is also known as snell s law, named for willobrord snell, who discovered the law in 1621. Bending light snells law refraction reflection phet. All these phenomena can be explained using the concept of refraction and an experimentally validated equation known as snells law. Despite the simplicity of the laws of light reflection and snells law. You will investigate fiber optics and light pipes and you will gain an elementary understanding of how lenticular lenses. You will monitor a reflected and a transmitted ray to decide whether the law of reflection andor snells law of refraction predict your observations adequately. Refraction and snells law lab, kristin michalski, hs, lab, astronomy physics. The mathematical description of refraction, or the physical change in the direction of a wavefront as it travels from one medium to another with a change in velocity and partial conversion and reflection of a pwave to an swave at the interface of the two media. In the second part of the lab, you will be verifying the law. Light is an electromagnetic disturbance and, as such, is described using maxwell s equations, which expresses the relationship between the electric. Especially those in the hard candy business, snell s law is a very easy way to measure the amount of sugar in a supersaturated hard candy solution.
This is the official website of the snell lab in the department of geosciences at the university of colorado in boulder toggle navigation. The law follows from fermats principle of least time, which in turn follows from the propagation of light as. If the solution were more concentrated, n 2 would increase, making the term on the right. Snells law applies to the refraction of light in any situation, regardless of what the two media are. Snells law experiment with glass block physics forums. Description explore bending of light between two media with different indices of refraction. Using snells law to predict an angle value as with any equation in physics, the snells law equation is. The effect that the angle of incidence of white light has on the angle of refraction from one transparent medium to another.
To use snells law to determine the index of refraction n of a piece of glass and to use it to find the speed of light in that glass. Using snells law to predict an angle value as with any equation in physics, the snells law equation is valued for its predictive ability. Laser level, protractor, plate glass, plain paper, pencil, data sheet. This law also applies to the bending of light by lenses and to. In this lab, students use an optics ray table to measure the incident and refraction angles of a light ray traveling from air into a material with unknown. Snells law and the index of refraction introduction. Introduction to snells law, its cause, and applications in fiber.
Snells law states that the ratio of the sine of the angles of incidence. This law states that the index of refraction of the incident medium multiplied. This law was discovered in 1621 by the dutch astronomer and mathematician willebrord snell. Finally, anyone who works in fiber optics can thank this law for their job.688 180 1103 1471 692 142 661 889 1144 1513 723 634 869 1462 498 1248 929 283 155 555 1293 1204 145 657 1332 943 930 1056 825 1192 967 605 480 1478 98 411 1109 708 7 1493 1073