1a. Consider the double-slit arrangement shown in Figure 5, where the sli separation is d and the distance from the slit to the screen is L. A sheet o transparent plastic having an index of refraction n and thickness t is placed over the upper slit. As a result, the central maximum of the interference patterr moves upward a distance y '. Find y'. e L Plastic m= 0 sheet Viewing screen

1a. Consider the double-slit arrangement shown in Figure 5, where the sli separation is d and the distance from the slit to the screen is L. A sheet o transparent plastic having an index of refraction n and thickness t is placed over the upper slit. As a result, the central maximum of the interference patterr moves upward a distance y '. Find y'. e L Plastic m= 0 sheet Viewing screen