![]() When a ray of light passes through a glass prism, refraction (or bending) of light occurs both, when it enters the prism as well as when it leaves the prism. Refraction of light through a Glass Prism In refraction through a glass prism, the emergent ray is deviated from its original direction by a certain angle. ![]() In refraction through a glass slab, the emergent ray is parallel to the incident ray but in refraction through a glass prism, the emergent ray is not parallel to the incident ray because the opposite faces of the glass prism (where refraction takes place) are not parallel to one another. A triangular glass prism is usually called glass prism. The angle between its opposite faces is called the angle of the prism.įor the sake of convenience in drawing ray-diagrams, a triangular glass prism is represented by drawing a triangle. They are inclined at an angle to one another. The triangular glass prism is a transparent object made of glass having two triangular ends and three rectangular sides (or rectangular faces).The opposite faces of a triangular glass prism are not parallel to one another. ![]() In a rectangular glass slab, the emergent light rays are parallel to the incident light rays because the opposite faces of a rectangular glass slab (where refraction takes place) are parallel to one another. ![]() 4 Re-Combination of Spectrum Colours to Give White Light.2 Refraction of light through a Glass Prism.
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