Please answer the following A circular scale like the one you will use to study
ID: 1345519 • Letter: P
Question
Please answer the following
A circular scale like the one you will use to study reflection and refraction is shown in Figure (a). The laser beam passes over the zero mark on the circular scale. A semicircular transparent plate has its straight edge aligned as shown. Point N is at 32.0 degrees, and point C is at 190.0 degrees. The semicircular transparent plate is then reoriented, as in Figure (b), to study the total internal reflection. If the refracted beam just disappears when the flat surface of the semicircle is aligned with AA', what is the position of point R?Explanation / Answer
angle i =320
Angle r=220
n2 = Sin(32)/Sin(22)
=1.414
Sin(theta critical) = 1/1.414
Theta critical = 44.9840
position of R= 2*44.9840=89.9680