As the rules are applied in the construction of ray diagrams, do not forget the fact that the law of reflection holds for each of these rays. In the next section of Lesson 3, these two rules will be applied to determine the location, orientation, size and type of image produced by a concave mirror. These two rules will greatly simplify the task of determining the image locations for objects placed in front of concave mirrors. These two rules of reflection are illustrated in the diagram below. Any incident ray passing through the focal point on the way to the mirror will travel parallel to the principal axis upon reflection.Any incident ray traveling parallel to the principal axis on the way to the mirror will pass through the focal point upon reflection.The simpler method relies on two rules of reflection for concave mirrors. A simpler method of determining a reflected ray is needed. For each incident ray, a normal line at the point of incidence on a curved surface must be drawn and then the law of reflection must be applied. The use of the law of reflection to determine a reflected ray is not an easy task. The image was merely that location where all reflected rays intersected. In the previous section of Lesson 3, the image of an object for a concave mirror was determined by tracing the path of light as it emanated from an object and reflected off a concave mirror. Thus to determine this location demands that one merely needs to know how light reflects off a mirror. The image location is the location where all reflected light appears to diverge from. Using reflection laws allows one to determine the image location for an object. What are some reasons for our percent error in this experiment? (5 points) 8.Light always reflects according to the law of reflection, regardless of whether the reflection occurs off a flat surface or a curved surface. Using Snell's Law, explain why the index of refraction is a dimensionless quantity (5 points)ħ. What is the percent error between the measured and calculated values of the critical angle? Use the calculated as the theoretical value. Using the measured index of refraction, calculate the critical angle for the rhombus surrounded by air. Describe the relationship between the angle of incidence and angle of refraction. Describe what happens as the ray of light enters the rhombus (10 points) The light was refracted due to the change of the change of speed of light 3. From the graph, determine the Index of Refraction of the material the rhombus is made from. Use Excel to graph the sin of the angle of incidence vs the sin of the angle of refraction. Refraction Data Table (15 Points) Sin (19) = 0.32 Sin Bo) = 0.50 sin66) = 0.58 Rhombus Prism Angle of Refraction (degrees) 19 30 Critical Angle (degrees) Sin/291-0.48 Sin cus) = 0.41 sin (61)= 0.87 Angle of Incidence (degrees) 29 L 46 41 1. The experimental Yes, each single ray obeys the law angles of reflections were very similar to the angles of incidence. Does the relationship hold true for all mirrors? Cite evidence to support your position. What is the relationship between the angle of incidence and the angle of reflection? (5 points) The law of reflection states that when a ray of light reflects off a surface, the angle of incidence is equal to the angle of reflection Oi-or 2. Reflection Data Table (10 points) Angle of Reflection (deg 40 Plane Mirror Convex Mirror Concave Mirror Angle of Angle of Angle of Angle of Angle of Angle of Incidence Reflection Incidence Reflection Incidence Reflection (degrees) (degrees) (degrees) (degrees) (degrees) (degrees) 30 30 30 30 30 45 45 - 45 45 I 45 45 1 60 60 60 60 60 1.
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