ࡱ> Uu bjbj]] 17f7f3G'vv$$$$$$$$8T$$|$Zd%~&"'''%,ٺ$A\$@%$$''w4$'$'h 'ZfZ<jSyzS ZS$d4SvX ": Episode 317: Reflection and refraction of waves This episode starts from the phenomenon of refraction and moves on to Snells law. Lesson Summary Demonstration and discussion: Reflection and refraction with ripple tank (15 minutes) Discussion and student activity:Marching soldiersmodel of refraction (10 minutes) Student experiment: Ray tracing through rectangular block (30 minutes) Discussion: Refractive index and Snells law (20 minutes) Worked example: Using refractive index (10 minutes) Student questions: Calculations involving refractive index (30 minutes) Discussion: Summary (10 minutes) Discussion and demonstrations: Reflection and refraction with ripple tank Show reflection of ripples at a straight barrier. Start with straight ripples striking a straight barrier, at an angle. Continue with a single straight ripple, then a curved ripple. To show refraction with a ripple tank, you need to show how ripples change speed when travelling from deeper into shallower water (or vice versa). Submerge a sheet of glass in the water to provide an area of shallower water; the shallower, the better. Start with ripples arrivinghead onto the boundary between deep and shallow water. You should be able to see that the separation of the ripples has decreased; this is because they are travelling more slowly.  INCLUDEPICTURE "https://spark.iop.org/sites/default/files/media/images/reflection.gif" \* MERGEFORMATINET  Now alter the position of the glass so that the ripples enter the shallower area at an angle. It can help to concentrate on and one ripple at a time; simply depress the vibrating bar and release it. You should see that the ripples change direction. Now show diagrams to summarise these observations. Reflection When the first part of the ripple touches the barrier a semicircular wave starts to travel away from the point of contact at the same speed as the incoming wave. This happens for every point on the ripple. The tangent to the new circles is the new wavefront. In the time taken for the end of the ripple farther away to reach the barrier, the reflected wave has travelled outwards the same distance so the equal angles can be seen. Refraction Snells Law may have been covered previously but probably obtained experimentally by ray tracing with no reason given for the form of the law. Closer examination of the wave behaviour shows clearly the relationship between the two velocities and the sine of the angles.  INCLUDEPICTURE "https://spark.iop.org/sites/default/files/media/images/refraction.gif" \* MERGEFORMATINET  Fermats principle of least time can be useful here a ray of light, travelling between two points, takes the path of shortest time. An analogy of seeing someone in a river works well; to rescue them, you would run along the bank (greater speed) until you judged it sensible to swim (lower speed). The path taken is that followed by light. Remind the students of the reversibility of light too. It often helps with problems. Discussion and student activity: Marching soldiers model of refraction Here is a practical way of explaining refraction. Students form a line, arms linked. They march forwards in step, so that they meet a boundary between, say, tarmac and grass obliquely. On the grass, they march more slowly. The outcome is that the line bends and changes direction. A comparable effect is the skidding of a car if its wheels on one side leave the road and start slipping on a grassy verge. The car slews round.  INCLUDEPICTURE "https://spark.iop.org/sites/default/files/image/refracting-soldiers.gif" \* MERGEFORMATINET  Another analogy uses soldiers: As the soldiers walk onto the sand they slow down and so each line of soldiers bends. They end up moving in a different direction this is just what happens when a beam of light hits a block of glass at an angle it refracts.  HYPERLINK "https://spark.iop.org/sites/default/files/media/documents/episode-317-1-refraction-soldiers-walking-from-tarmac-onto-sand.doc" Episode 317-1: Refraction: soldiers walking from tarmac onto sand (Word, 60 KB) - see end of document Student experiment: Ray tracing through rectangular block Students can gain practice in ray tracing through using a ray box and rectangular glass block. They can investigate Snells Law or make measurements of refractive index.  HYPERLINK "https://spark.iop.org/sites/default/files/media/documents/episode-317-2-measuring-refractive-index.doc" Episode 317-2: Measuring refractive index(Word, 28 KB) - see end of document Discussion: Refractive index and Snells law Explain the meaning of refractive index, and state Snells law. Points to mention concerning refraction: Angles are measured from the normal (because this works if the interface is curved). It is useful to remember which way the bending occurs (towards the normal when slowing down). Rays only bend at points where their speed is changing (usually at interfaces between different media). The refractive index of a material (i.e. theabsoluterefractive index) means relative to a vacuum, but this value is a good enough approximation where the other material is air. Worked examples: Using refractive index A useful equation derived from Snell s Law using absolute refractive indices is: n1sin( 1)=n2sin( 2) A ray of light travelling from water to glass is incident at 50 to the normal. Calculate the angle of refraction in the glass. (nwater=1.33 nwater=1.5) n1sin( 1)=n2sin( 2) glass=42.8 Student questions: Calculations involving refractive index  HYPERLINK "https://spark.iop.org/sites/default/files/media/documents/episode-317-3-questions-on-refractive-index.doc" Episode 317-3: Questions on refractive index(Word, 27 KB) - see end of document  INCLUDEPICTURE "https://spark.iop.org/sites/default/files/media/images/concave-lens.gif" \* MERGEFORMATINET  Discussion: A summary Show diagrams of wavefronts going through a prism and both types of lens. Remind students that this behaviour applies to other waves e.g. sound (a balloon filled with CO2can act as a converging lens). Summarise the ideas you have been looking at: reflection and refraction can both be explained with the idea of waves.  INCLUDEPICTURE "https://spark.iop.org/sites/default/files/media/images/refraction.gif" \* MERGEFORMATINET   HYPERLINK "https://spark.iop.org/sites/default/files/media/documents/episode-317-4-more-about-snell-s-law.doc" Episode 317-4: More about Snell's law(Word, 110 KB) - see end of document  HYPERLINK "https://spark.iop.org/sites/default/files/media/documents/episode-317-5-the-invisible-man.doc" Episode 317-5: The invisible man(Word, 26 KB) - see end of document Episode 317- 1: Refraction: soldiers walking from tarmac onto sand  As the soldiers walk onto the sand they slow down and so each line of soldiers bends. They end up moving in a different direction this is just what happens when a beam of light hits a block of glass at an angle it refracts. Practical advice This will work with a single line of students if you do not have enough to form rows. Alternative activity You may wish to use an applet instead or in addition to the above. This Java applet shows transmission and reflection of waves at a boundary, showing wavefronts as summations of scattered wavelets:  HYPERLINK "http://www.phy.ntnu.edu.tw/java/propagation/propagation.html" http://www.phy.ntnu.edu.tw/java/propagation/propagation.html External references The soldiers activity is taken from Resourceful Physics Episode 317 - 2: Measuring refractive index By tracing rays of light through a rectangular block of transparent material and measuring the angles at the interfaces, use Snells law to calculate the refractive index for that material. Apparatus rectangular glass or perspex block ray box or optics lamp 1 cylindrical lens 1 single slit power supply leads protractor A4 plain white paper shaded or darkened conditions Safety It may be necessary to remind some students that ray boxes become very hot over 30minutes. Preparation You will be using Snells law to determine values for the refractive index of transparent materials:  EMBED Equation.3   Have a look through the instructions below, and decide how best to record information in a systematic way from the start of this activity. Measurements and calculations Using the apparatus shown above, direct a ray of light to enter the block near the middle of the longest side and to leave by the opposite side crossing directly from one side to the other. As you change the angle of the block to the light, notice the alterations in the direction of the emerging ray. Draw round the edges of the block for one arrangement. Mark the paths of the light outside the block with a few pencil dots. Remove the block and draw in (with a ruler) the path of the ray through the block as a straight line. Use arrows to show which way the light travelled. Construct a normal where the ray enters the block and measure i and r. Estimate the experimental uncertainty on your measurements of i and r. Repeat for at least five different angles of incidence. Calculate the refractive index for the material of your block. Return to your ray diagrams. Measure the angles of incidence and refraction for the ray as it leaves the block. Calculate the refractive index at the exit. Extension You will have to add a lens to the ray box to make suitable beams of light for this part of the activity. Go back to your apparatus and find out how a broad beam of light emerges from the block if it enters as: (a) a parallel beam (b) a converging beam. Describe your observations. Writing up Write a short account of this activity for your own use later in the course when you need to revise this work. Include a diagram and a clear record of your measurements and calculations. Include your answers to these questions in your account: How does the value of refractive index for the emerging light relate to the earlier value you found for light entering a material? Could you have predicted this? What is the connection between the directions in which the light travels as it enters the block to that when it leaves? Describe any evidence you have to show that the coating on a compact disc (CD) sharpens the focusing of the beam. Include a diagram if possible. Practical advice Snells law of refraction This is a standard practical method to determine refractive index for glass or perspex. For some students, this might be pre-16 level revision. You might need to explain to students that we measure angle from the normal not the surface so as to be able to deal with surfaces that are not plane. Students should appreciate that the angles are related to changes in the wave speed. The calculations give an opportunity for the revision of sine functions and the use of calculators. Encourage the mathematically timid to write out their calculations line by line. Some students might find the use of suffixes off-putting so encourage them to treat them as useful labels. Insist on clear drawings. If this is the students first experience of ray diagrams, ground rules need to be made about using rulers and sharp pencils. Check that students can use protractors with precision. Agree with students beforehand what you require in the way of a written account of this work and its format. We suggest asking them to produce summary notes and diagrams for their own later use. External reference This activity is taken from Salters Horners Advanced Physics, section TSOM, activity 22 Episode 317- 3: Questions on refractive index Take c = 3.0 ( 108 m s-1 in air 1. The speed of light in a certain glass is 1.8 ( 10 8 m s-1 . What is the refractive index of the glass? 2. The refractive index of diamond is 2.4. What is the speed of light in diamond? 3. The refractive index changes with the colour of the light leading to dispersion. If the refractive index for blue light in a certain glass is 1.639 and for red light is 1.621, calculate the angle between the rays if they were both incident at 50o. 4. Find the relative refractive index from glass to water if the absolute indices are 1.5 and 1.3 respectively. Answers and worked solutions 1. ng = c/cg = 3.0 ( 108 / 1.8 ( 108 = 1.67 (no unit as refractive index is a number) 2. nd = c/cd so cd = c/nd = 3 ( 108 m s-1 / 2.4 = 1.25 ( 10 8 m s-1 3. For blue light, sin q = sin 50 / 1.639 = 0.4674 and q = 27.86o For red light, sin q = sin 50 / 1.621 = 0.4726 and q = 27.20o The angle between the two rays is the difference so = 0.86o. [NB with a prism red is deviated least ( red tries to go straight ahead pronounce  ahead as  a red ), useful to learn. The diffraction grating spreads out the colours with blue deviated most.) 4. gnw = nw / ng = 1.3 / 1.5 = 0.87 External reference This activity is taken from Resourceful Physics Episode 317- 4: More about Snell's law This page will help you to understand where light rays go when they are refracted; it also includes worked examples using Snell's law, and some background ideas which may answer any remaining questions you have about the way in which light rays are refracted. More about Snell's law Diagrams for different angles of incidence Glass has a higher refractive index than air. It may help to think of glass as a '(optically) denser' material than air.  Entering an optically denser material: the ray bends towards the normal.  Greater angle of incidence i: greater angle of refraction r.  Entering a less optically dense material: the ray bends away from the normal. Note: There is always a partially reflected ray with the angle of incidence equal to the angle of reflection.  If a ray is travelling in the opposite direction, the angles are the same as before. (Compare with the diagram above.)  For a rectangular block: the final ray is parallel to the initial ray.  A lens: shaped so that the ray bends twice in the same direction. Note: A ray only bends at the point where it travels from one medium to another. It doesn't curve as it passes through the glass. Worked examples Example 1  Find the angle of refraction r. Snell's law gives: EMBED Equation.3EMBED Equation.3 Rearranging: EMBED Equation.3 Substituting in values: EMBED Equation.3 To get sin 25 use the sin button on your calculator. EMBED Equation.3 Here, you use the unfortunately named sin 1 button on your calculator  usually inv and sin buttons. (We say  r is the angle whose sine is 0.282' or  r is arcsin 0.282'.) Example 2  In example 1 the ray of light was entering glass from air. It slowed down that's what the refractive index tells us. In this example, the ray is leaving the glass and entering air. It speeds up. In Snell's law we must put n = 1 / 1.5 (the refractive index is the reciprocal of 1.5). 'Reciprocal' means 'one over' look for the 1 / x key on your calculator. Snell's law gives: EMBED Equation.3 Rearranging (as in example 1): EMBED Equation.3 Substituting in values: EMBED Equation.3 EMBED Equation.3 Normal incidence What happens when a ray of light hits the glass at 90?  The incident ray is travelling along the normal, so this is sometimes called 'normal incidence'. The angle of incidence is 0 (not 90, because we measure from the normal to the ray). The angle of refraction is also 0. This means that the ray passes straight through without bending. Why we draw the normal   If a ray of light hits a curved surface, where will it go? If we measured angles from the ray to the surface, we would have problems. The surface is not flat, so we can't say what the angle is. For a curved surface, we can always draw the normal. Then we can be sure how big the angles are. The same applies to reflection. When a ray strikes a curved mirror, we draw the normal to work out where the reflected ray will go. Practical advice Help with Snell's law, including ideas about the angles to measure, how to use the equation and the special case of normal incidence, will probably be required. Alternative approaches Students could be asked to set up ray boxes, glass blocks etc to reproduce the diagrams on the sheet. Social and human Context Newton believed that light probably travelled faster in glass than in air. Students could find out about different attempts to explain refraction and to explain Snell's law using particle and wave models. Later on, least time principles will provide a more satisfying explanation. 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The author H G Wells wrote a story called 'The Invisible Man' about the problems of a man who was precisely that. 1. What can you say about the refractive index of such an individual? 2. If such a person was truly invisible would he be able to see objects around him? Practical Advice This question could be linked to a demonstration of the disappearance of a solid in a liquid when the refractive indices are the same (e.g. a glass test tube in a suitable glycerol water solution). The question invites an exploration of possibilities based on some scientific understanding. The question may form the basis of a discussion rather than a formal written answer Social and human context Much science fiction depends on suspending some, but not all, correct descriptions of nature. Students may be aware of some of these and a profitable discussion can be had. Answers and worked solutions 1. His refractive index would be equal to that of the air around him, otherwise refraction effects would slightly bend rays passing through him leading to small distortion effects in the image of objects seen through the man. 2. Probably not. Detection by the retina implies that light is absorbed, so someone looking through the back of the invisible man's head would be able to detect the lack of light where the light was absorbed it's still a good story though! 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