The angle on a straight line is 180°. The angle VOY = 180°. The angle at the centre is double the angle at the circumference. Angle VWY = \(\frac{1}{2}\) of angle VOY = \(\frac{1}{2} ...

Plot a graph of sine of angle of incidence (y axis ... from the two crosses does not pass through the centre of the semi-circle the ray path should be repeated. To ensure the refracted ray ...