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  Refection o Light in Mirrors Have you noticed the word “AMBULANCE” in an ambulance car? How is it written? Didyou ever wonder why it is written that way? You will fnd the answers to thesequestions as you go through this module. Try the ollowing activity to study one o theproperties o light. Activity 1 Mirror, mirror, on the wall… Objectives: ã Determine the height, width, and the distance rom the mirror o the image ormedby plane mirrors.ã Compare the actual height, width and the distance rom the mirror o the object withthat o the image ormed by plane mirror. Materials: ã 1 (10 cm x 15 cm) plane mirrorã 1 graphing paperã 10 one–peso coinsã modeling clayã pen Procedure: 1.Let the mirror stand vertically along a line on a graphing paper as shown inFigure 1. Use the modeling clay to support the plane mirror.2. Using a pen, make three (3) dierent marks along the intersections on the graphingpaper in ront o a mirror.  3. Measure the distance o each mark rom the mirror by counting the number o parallel lines between the mark and the base o the plane mirror. Record your data in atable similar to Table 1 below.4. Look at the images o the marks ormed by the mirror. Measure the distance o eachimage rom the mirror by counting the number o parallel lines between the image andthe base o the mirror. Record this also in Table 1.Q1. Reer to Table 1, compare the distance (number o parallel lines) rom the mirror o the object with that o the image.5. Stack 10 pieces o one-peso coin in ront o the plane mirror as in Figure 2. Using aruler, measure the height and width o the stack o coins. Measure also the height andwidth o the image as seen on the mirror. Enter your measurements in a table similartoTable2.Q2. How do the height and width o the object compare with the height and width o the image?Reection is the bouncing o o light rays when it hits a surace like aplane mirror. In the activity, you used plane mirrors and located the objectdistance, p and the image distance, q and ound out that p is equal to q. Inplane mirrors, the image appears as i it is behind the mirror but actually not,so the image is virtual. The value thereore o image distance, q is negative. The height o the image, h’ in plane mirrors is always the same as the heighto the object, thus its magnifcation, M is 1. The magnifcation ormula is writtenbelow: To learn more about reection o light in plane mirrors, try the next activity.However, here are some important terms which you need to understand frst. Incident Ray . The ray o light approaching the mirror represented by anarrow approaching an optical element like mirrors. Refected Ray . The ray o light whichleaves the mirror and is represented by anarrow pointing away rom the mirror. Normal Line . An imaginary line  (labeled N in Figure 3) that can be drawnperpendicular to the surace o the mirrorat the point o incidence where the raystrikes the mirror. The angle between the incident ray and the normal line is known as theangle o incidence, Ө i  . The angle between the reected ray and the normal isknown as the angle o reection, Ө r  . Figure 3. Reection o aLight Ray on a Plane Mirror176


Oct 7, 2019


Oct 7, 2019
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