3Center the viewing screen of the special component carrier designed for use with the angular translator,and place the assembly on the rotating table of the translator so that the front surface of the viewing screen coincides with the scored line on the table which runs perpendicular to the optical bench. 4Now switch on the light and adjust the aperture mask's position(do not move the component carrier),until the entire image is on the viewing screen.With the aid of the millimeter scale marked on the screen,center the image horizontally.Turn the screen 900 and center the image vertically. Aperture Mask Angualar Incandescent Viewing Light Source Screen Figure 1.1:Experlment Setup 5Now replace the viewing screen with the flat surface mirror such that the mirror surface coincides with the perpendicularly scored line.Move the viewing screen to the first analyzer holder on the movable are. 6Rotate the table a set number of degrees(for example,30),and then move the arm until the reflected image is centered horizontally on the viewing screen.Record the angle which the arm marks with the mirror.Repeat for various settings of the rotating table.What is the relation between the angle of incidence and the angle of reflection?(Angle of incidence is the angle the incident ray makes with the normal to the reflecting surface;similarly for the angle of reflection. 7 Rotate the viewing screen and measure the vertical position of the reflected image.Now measure the vertical position of the aperture mask.With this data determine what spatial relationship exists between an incident ray of light,the reflected ray,and the normal to the mirror at the point of reflection.(e.g.Do they lie in the same plane?). PartⅡ：Reflections From Glass And Acrylic DReplace the flat mirror in Part I with the glass plate,taking care that the front surface of the glass coincides with the scored line. 2Rotate the table until the glass plate rests at a convenient angle with the optical bench. 3Move the arm until the reflected image is visible on the viewing screen.How many images of the rectangular aperture are there?Why? 2424 ③Center the viewing screen of the special component carrier designed for use with the angular translator, and place the assembly on the rotating table of the translator so that the front surface of the viewing screen coincides with the scored line on the table which runs perpendicular to the optical bench. ④Now switch on the light and adjust the aperture mask's position (do not move the component carrier), until the entire image is on the viewing screen. With the aid of the millimeter scale marked on the screen, center the image horizontally. Turn the screen 900 and center the image vertically. ⑤Now replace the viewing screen with the flat surface mirror such that the mirror surface coincides with the perpendicularly scored line. Move the viewing screen to the first analyzer holder on the movable are. ⑥Rotate the table a set number of degrees (for example, 300 ), and then move the arm until the reflected image is centered horizontally on the viewing screen. Record the angle which the arm marks with the mirror. Repeat for various settings of the rotating table. What is the relation between the angle of incidence and the angle of reflection? (Angle of incidence is the angle the incident ray makes with the normal to the reflecting surface; similarly for the angle of reflection.) ⑦ Rotate the viewing screen and measure the vertical position of the reflected image. Now measure the vertical position of the aperture mask. With this data determine what spatial relationship exists between an incident ray of light, the reflected ray, and the normal to the mirror at the point of reflection. (e.g. Do they lie in the same plane?). Part Ⅱ: Reflections From Glass And Acrylic ①Replace the flat mirror in Part I with the glass plate, taking care that the front surface of the glass coincides with the scored line. ②Rotate the table until the glass plate rests at a convenient angle with the optical bench. ③Move the arm until the reflected image is visible on the viewing screen. How many images of the rectangular aperture are there? Why?