Number of reflections = N = L / AC = L / d cot(α) The angle of incidence i = 90 - α = r = i' The number of reflections N that will take place between the two mirrors may be approximated as follows.ĭ) Let the angle made by the light ray and the axis of the two mirror system be α instead of 25 °. Hence i' = r = i = 75 °Ĭ) If the distance between the two mirrors id d = 4 cm, AC can be calculated as follows n1 and n2 are normal to the reflecting mirrors and are therefore perpendicular to the axis of the two mirror system.ī) the two mirrors are parallel and AB intersect both of them, hence angle r and i' are alternate interior and therefore equal in size. Let's use the diagram shown below to answer the questions. If L and d are fixed, what can be done to decrease the number of reflections on the mirrors and hence the energy lost by reflection? The ray makes an angle of 25° with the axis of the two mirrors.Ī) What is the angle of reflection at the point of incidence A?ī) What is the angle of reflection at the point of incidence B?Ĭ) If the distance between the two mirrors id d = 4 cm and the length L of the two mirror system is 3 meters, approximately how many reflections take place between the two mirrors?ĭ) In a real system, at each reflection, there are losses of the light energy travelling between the two mirrors. We use the diagram shown below to answer the questions.Ī) angle of incidence: i = 90 - 56 = 34 °ī)angle of reflection r = i = 34 ° (by the law of reflection)Ī ray of light is reflected by two parallel mirrors (1) and (2) at points A and B. (2) The angle of incidence i and the angle of reflection r have the same size.Ī light ray strikes a reflective plane surface at an angle of 56° with the surface.Ĭ) Find the angle made by the reflected ray and the surface.ĭ) Find the angle made by the incident and reflected rays. (1) The incident light ray, the reflected light ray and the normal to the interface at the point of incidence make a plane called the plane of incidence R is the angle made by the reflected ray and the normal to the interface and is called the angle of reflection. I is the angle made by the incident ray and the normal to the interface and is called the angle of incidence. The point at which the incident ray strikes the interface is called the point of incidence. The surface separating the two media is called the interface or boundary. We first look at the vocabulary used to describe the reflection of light. When light strikes a perfectly reflecting surface, such a mirror for example, all the light energy is reflected. When a light ray strikes a surface separating two media with different optical properties, part of the light energy is reflected back to the media where it coming from. Does Mr.Reflection of Light Rays on a Reflecting Surface Is the image real or virtual? (circle one). Foot is 6 feet tall, what is the size of his image in the mirror? c. Find the location of his image using ray tracing. Foot is looking at himself in a mirror mimor a. Draw a ray diagram that shows how light from both ends of the arrow reach the observer plane mirror 5. Position an observer's eye where the whole image could be seen. Locate and sketch the image of the arrow (Draw at least 2 rays coming from the top of the arrow and the bottom to find the image) b. A top view of a mirror and an arrow is shown below. Explain why observer 4 can't see the virtual image but observer I can.Ĥ. Show where observer #2, and #3 can see the virtual image by sketching rays. The ray diagram below shows where observer #1 sees the virtual image of the bulb. What do you notice about oth? reflective side of mirror 3. Measure and compare the image distance to the object distance. Extend the reflected rays with dotted lines behind the mirror to locate the virtual image. Include eyes at positions that could see the reflected rays. Use a protractor/ruler to sketch six rays that travel from the bulb to the mirror and reflect. A bulb is placed in front of a plane mirror. (Note: the dashed line indicates the "normal") Angle of reflection - Angle or incidence plane mirror 2. Draw the reflect ray and label the angle of reflection. Use a protractor to measure the angle of incidence of the light coming from the laser pointer. Law of Reflection Worksheet 2 laser pointer 1.
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