how can we release come out of the air from the glass show in the following diagram
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The angle made by the incident ray with the normal to the first face of the prism is called incident angle, which is angle Y here. The angle made by the emergent ray with the normal to the surface when it comes out from the prism after refraction is called emergent angle, which is angle Q here. The angle between the incident ray and the emergent ray is called angle of deviation, which is angle P here. Hence, the correct option is D.
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