A ray of red light passes through a glass block, as shown in Figure.
(i) On Figure, clearly label the angle of refraction.
(ii) State the name given to the dashed line drawn at $$90^\circ$$ to the boundary.

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A ray of red light passes through a glass block, as shown in Figure.
(i) On Figure, clearly label the angle of refraction.
(ii) State the name given to the dashed line drawn at $$90^\circ$$ to the boundary.