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I. EXPERIMENT NO. 1 Arrange the light source, parallel ray lens, and slit plate on the magnetic optical bench as Shown. For the time being, you will not insert the circular Scale, the acrylic semi-circle, or the slit mask. Adjust the position of the parallel ray lens parallel ray lens until the light rays from the 7 Slits are as close to parallel as you can get er them. You can tell when they are parallel by allowing the image of the slits to fal] on the ] slit plate ,. acrylic semi-circle screen as you slide the screen along the optical bench away from the slit plate. When the rays | are parallel, insert the slit mask to block all rays except the central ray. Now insert the circ scale ular scale and make sure the ray passes over e. You may need to adjust the parallel ray lens from stment. Finally, place the acrylic semi-circle on the at side is at the center of the scale. This adjustment is ; ke sure you have the alignment correct. side to side slightly to make this adju scale and make sure the center of the fl Rotate the scale counter-clockwise (as viewed age from the top) in ten-degree increments and record the values for the angles of incidence i, the angles of reflection i’, and the angles of refraction r in the table below. The reflected ray may be difficult to refracted ray see on the scale, so it might be necessary to hold " the white viewing screen next to the circular scale to see the ray better. The figure to the right shows the approximate location of the incident, reflected and refracted rays. The dashed line is the normal to the flat surface. incident ray Angle of incidence (i) | Angle of refraction (r) | Angle of reflection (i’) 0 | v O | }0 | | “hS | ) a | | yw i+ [<. -bestpegcre ut | 40 he a SNES | 3 | LOD | EE RE. L Ly | So 4 \. So | 5 | \90 4,7) if (0 10 24.50 at ss 2 8 
