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Q1.
Figure 12 shows a semicircular glass block.
Describe how a student could use the semicircular glass block and other apparatus to determine the critical angle for a glass-air boundary.
You should add to the diagram in Figure 12 to help with your answer.
(4)
To find the critical angle:
A ray of light is shone into the glass block.
The ray enters through the curved surface along a radius.
The angle is changed by moving the ray box until the refracted ray is at 90°, or just disappears (total internal reflection).
The angle of incidence is measured at this point.
The measurement is repeated to get a reliable result.
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