light passes through a rectangular glass slab and through a triangular glass prism in what way does the direction of the two emergent beams differ and why?
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In a rectangular glass slab, the emergent ray is parallel to the incident ray but they are not along the same line whereas in a prism the emergent ray is not parallel to the incident ray. This is because, in a glass block the two surfaces at which refraction occurs and is parallel to each other.
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