Recombination of the colours of spectrum forms ____ colour of the light.

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Detailed Solution

Recombination of the colours of the spectrum forms white colour of the light.
To prove this, an experiment was conducted by Sir Isaac Newton. Newton took two prisms,

P_{1}

and

P_{2}

, of the same material and having the same refracting angle. He passed light through a slit which fell on the prism

P_{1}

. And he obtained a spectrum (VIBGYOR) on the white screen.
As shown in the figure, he removed the white screen and placed a second prism,

P_{2}

, in an inverted position. The light coming out of prism

P_{2}

was almost white. This experiment proved that prism

P_{1}

dispersed white light; this prism is called dispersing prism. The second prism,

P_{2}

, recombined the seven colours; hence it was called the recombination prism. This experiment proved that a prism produces no colours, and the recombination of seven constituent colours forms white light.
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