A glass prism is able to produce a spectrum but a rectangular glass slab does not. Why?
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In a glass slab the two refracting surfaces are parallel to each other and only lateral displacement occurs and no deviation is there but in case of a prism the two refracting surfaces are inclined at an angle. so each colour of the white under goes a deviation based on the wavelength of the light . so a spectrum is observed. but in case ofa glass slab the net deviation is zero……………