a narrow beam of white light passes through glass slab having parallel faces. then, a) the beam inside the slab remain as white light , b) the emergent beam is red in colours , c) the beam inside the slab undergoes dispresion , d) the glass slab never causes dispresion
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a) the beam inside the slab remain as white light
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Due to dispersion , light at the violet end of the spectrum exhibits a larger angle of refraction on entering the glass than light at the red end . This causes splitting of all colours inside the slab . All the colours of light return to their original direction of propagation as they refract back out into the air . As a result , the outgoing beam is white .
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