A piece of red glass when heated in dark to red hot state, it will becomes :

White

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Red

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Green

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Invisible

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Solution

The correct option is D Invisible
We see an object to be of a particular colour, when the wavelength corresponding to that colour is not absorbed but it reaches our eyes.
Hence, when red glass is heated to red hot state, it emits only red colour and red is the wavelength absorbed.

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A piece of red glass when heated in dark to red hot state, it will becomes :

The correct option is D InvisibleWe see an object to be of a particular colour, when the wavelength corresponding to that colour is not absorbed but it reaches our eyes.Hence, when red glass is heated to red hot state, it emits only red colour and red is the wavelength absorbed.

The correct option is D Invisible
We see an object to be of a particular colour, when the wavelength corresponding to that colour is not absorbed but it reaches our eyes.
Hence, when red glass is heated to red hot state, it emits only red colour and red is the wavelength absorbed.