why dispersion of light does not take place in rectangular glass slab?
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because glass slab doesn't align at right angle as prism. So, dispersion of light doesn't occur in glass slab.
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Ritwik27:
i think it is due to the fact that rectangular glass slab is made from two prism keeps inverted in respect to each other.
one prism dispersed the white light in seven different colour and other inverted prism converse the seven coloured ligt to form single white ray of light.
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