Which of these conditions are necessary for the formation of dew?

Previous night has to be cold.

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Previous night has to be warm.

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Relative humidity has to be high.

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Relative humidity has to be low.

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Solution

The correct options are
A Previous night has to be cold.
C Relative humidity has to be high.
Dew is formed if the previous night was cold and the relative humidity was high. This results in conversion of water vapour present in the atmosphere into liquid water.

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