Jin Hyuk Choi, Hyun Su Lim, Daehan Choe, Namyong Eom PHY For Mr. Wilder Lab Presentation: Field of Vision from The Plane Mirror

What is the purpose? To examine the field of vision of a viewer at a fixed position relative to a plane mirror

 1 x Plane Mirror  1 x a sheet of cardboard or particle board  1 x Sheet of paper  1 x Ruler  Pins  1 x A grease pencil  1 x Protractor Materials

1.Place a sheet of paper on the board. 2.Mark a point on the centre of the plane mirror. 3.Place the mirror at the end of the paper and mark its position with a line along the reflecting surface of the mirror. Procedures

4. Draw a normal at each end of the mirror. 5. Indicate your viewing position on the paper. 6. Place your eyes at the position indicated. Procedures (cont’d)

7. Look at the point drawn on the middle of the plane mirror. - Keep in mind that it is possible to shift eyes around but the head shouldn’t be moved. 8. Place the pins into different areas of the paper in front of the mirror. Procedures (cont’d)

9. Find at least three precise points on each side of the paper at which the pin just disappears from view. Mark these points by pinning them on and out the paper to make a hole on it. 10. Draw lines connecting the points to the edge of the mirror. Procedures (cont’d)

11. Draw a scale diagram of the eye position, the mirror, and the points where cannot be seen on the eye position. 12. Shade the region of vision. This is the field of vision. Procedures (cont’d)

13. By using a protractor, measure the angle of incidence between the normal and lines connecting the points to the edge of the mirror. Then measure the angle of reflection between the normal and the lines from the eye position to the edge of the mirror. Procedures (cont’d)

Data table 1: The mirror size, the location of the viewing position & the values of angles Width of the plane mirror (cm) Distance to the viewing position (cm) Angle of incidence ( ° ) Angle of reflection ( ° ) Data

Diagram 1: Field of vision for the plane mirror Data (cont’d) Incident ray Reflected ray Eye position Normal mirror

At the end of the experiment, it was found out that the field of vision (the area that can be seen from the mirror) is the area within two incident rays in front of the mirror’s reflective surface. Analysis

Relationship during the experiment -When a normal is drawn at each edge of the mirror, the reflected rays can be found from the each edge of the mirror to the eye position. -Then, the incident rays to the end of the mirror can be found. (Angle of incidence = Angle of reflection)  Able to predict the field of vision Analysis (cont’d)

Possible sources of error -Slight movements of the head Suggestion of improvements - Some tools (rubber sheet etc.) that hold the observer’s steadily during the experiment Analysis (cont’d)

In the experiment, how was field of vision of the viewer observed? According to the data, what influenced the field of vision of the viewer? Through this experiment, what have we learned? What kind of application that is related to the field of vision exists? Conclusion