when a ray of light passes through a rectangular glass block, the direction of emergent ray is ________ to incident ray. fill in the blanks
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In case of a rectangular glass slab, emergent rays of light are always parallel to the direction of incident rays. When a light ray passes through a prism, it bends towards the base of the prism. Hence, incident ray and emergent ray are not parallel to each other as they are in case of a glass slab.
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Parallel
Explanation:
when a ray light passes through a rectangular glass block, the direction of emergent ray is parallel to incident ray
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