The angle of deviation is represented by ÐD in the diagram. It is the angle between the direction of the incident ray and the direction of the emergent ray after passing through the prism.
How can the angle of deviation be visually identified in the given activity with the prism?
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To visually identify the angle of deviation in an activity with a prism, observe the spectrum formed when white light passes through the prism. The angle of deviation is the angle between the incident and emergent beams. Locate the incident light direction (original white light) and the direction in which the different colors emerge after passing through the prism. The angle between these paths is the angle of deviation. It is often measured from the direction of the incident beam to the direction of the emergent beam. This angle quantifies the extent of dispersion and deviation of different colors by the prism.