how to convert light dispersed by prism again into white light?
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pass dispersed light through an inverted prism then will obtain white light
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White light when passes through a glass prism it is dispersed in VIBGYOR.
As per the question our motto is to turn that dispersed light into white undispersed state again.
To achieve that take an identical glass prism with the initial which dispersed the white light at the first place. Now place the prism invertedly in respect to the initial position.
Like if the first prism had its rectangular plane downwards then put the edge(opposite to the rectangular plane) of the 2nd prism downward to achieve white light formation.
--- Α Ξ ∀ ---
'---' is undispersed light.
'Ξ' is dispersed light.
'Α' is the first prism with its base downwards.
'∀' is the second prism with its top edge downwards.
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