Figure below shows two identical prisms ...

Figure below shows two identical prisms A and B placed with their faces parallel to each other. A ray of light of single colour PQ is incident at the face of the prism A. complete the diagram to show the path of the ray till it emerges out of the prism B.

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The emergent ray out of the prism B will be parallel to the incident ray PQ

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ICSE-REFRACTION OF LIGHT AT PLANE SURFACES-EXERCISE-4(B)

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