Refraction Worksheet

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University of South Florida *

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2054L

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Physics

Date

Dec 6, 2023

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docx

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Uploaded by ConstableExploration4863

REFRACTION Name(s): 1. From your optics set select the rectangular block of glass. Set your light box so that a single beam emerges from it. You are going to measure the angle of reflection and the angle of transmission for three different incident angles which you will choose. To do this, you will need to lay the glass block on a blank sheet of paper and trace its outline. With a ruler, construct a line perpendicular to the front air/glass interface. This will be the line from which you measure the angles. Your light beam should strike the interface at the point where this line intersects the interface. Choose an incident angle and mark your paper so you can measure the reflected and transmitted angle. Your paper should look something like the figure below. The arrows are your light beam. The X s are marks you will need to make. Having constructed this diagram, you should be able to measure the angles with a ruler and a protractor. Construct diagram for three incident angles of your choice and complete the data table below. (Insert a NEAT photo of the constructed diagram on the next page) Table 01: Incident Angle Reflected Angle Refracted Angle Transmitted Angle 45 1.41 30 1.46 33 15 1.49 40 Have you been able to verify the law of reflection? Explain! For each case tabulated above, calculate a value for the index of refraction for glass. Table 02: Incident Angle Refracted Angle Index of Refraction (n g ) Calculate the average of the acquired values of index of refraction and compare it with the accepted value of the index of refraction of glass by evaluating the percent difference.

For the following calculation you will need to know the index of refraction for glass. Choose the value you are going to use and justify that choice in the space below. Using Snell's law, calculate the critical angle for light encountering the glass/air interface. Show your work in the space below.

2. Select the semicircular piece of glass from the optics set and set the light box so that one beam of white light emerges. Using a piece of paper, pencil, and a protractor you should be able to determine the critical angle for light passing from glass to air. Your diagram should be like the figure below. The X in the figure marks the interface of interest. From your diagram, measure and record the critical angle, and compare it with your calculated value by evaluating the percent difference in the space below. Insert a NEAT scanned photo (you can use your phone) of the constructed diagram. With the same experimental arrangement, describe what happens as you increase the angle of incidence so that it is larger than the critical angle.

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3. Set your light box to deliver three parallel beams of white light. From the optics set, select a piece of glass which is convex on both sides. Arrange your glass and light as shown in the diagram below. Using the figure above, sketch what happens to the light when it passes through the glass. Glass shaped in this way forms a converging lens. The distance from the lens to the point where the light rays converge is called the focal length. Measure and record the focal length of this lens. Focal length = Insert a NEAT scanned photo (you can use your phone) of the constructed diagram. Set your light box so that it delivers a single beam of light. Place that single beam at the focal point of your lens. Your configuration should look like the figure below.

Leave the light box at the focal point and rotate it. What happens to rays of light that originate at the focal point of a converging lens? Insert a NEAT scanned photo (you can use your phone) of the constructed sketch for the scenario concerned. Reset your light box so that three beams of light emerge. In your optics set, locate the piece of glass that is concave on both sides. Arrange your glass and light as shown in the diagram below.

Sketch what happens as the light passes through the glass. (Insert a photo of the sketch in the space provided below) Glass shaped like this forms a diverging lens. Talk with your lab partner and decide what would correspond to a focal point for this lens. Sketch the emerging rays and the corresponding focal point and insert a NEAT photo of the sketch in the space provided below. The distance between the optical center of the medium (Lens) to the focal point is called focal length. Please, provide the value of the calculated focal length. Focal Length =

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