Explanation:

• When the moisture is deposited in the form of water droplets on cooler surfaces of solid objects (rather than nuclei in air above the surface) such as stones, grass blades and plant leaves, it is known as dew.
• The ideal conditions for its formation are clear sky, calm air, high relative humidity, and cold and long nights.
• Clear sky: A clear sky allows for maximum radiative cooling, which causes the surface temperature to cool more quickly, increasing the likelihood of the air around it to reach its dew point.
• Calm air: Calm air reduces the amount of mixing in the atmosphere, allowing for a layer of cool, moist air to form near the surface, which increases the likelihood of the air reaching its dew point.
• High relative humidity: High relative humidity means that the air is already close to being saturated with water vapor, making it more likely to reach its dew point temperature and form dew.
• Cold temperatures: The cooler the temperature, the more likely the surface temperature will reach the dew point temperature of the surrounding air, causing dew to form.
• Long nights: Longer nights allow for more time for the surface to cool, increasing the likelihood of the air reaching its dew point temperature and causing dew to form o Hence statement 1 is correct.For the formation of dew, it is necessary that the dew point is above the freezing point.
• If the temperature of the surface is below the freezing point, the water vapor in the air will freeze directly onto the surface as frost, rather than condensing into liquid droplets as dew.
• Therefore, for dew to form, the temperature of the surface must be above the freezing point of water.Hence statement 2 is not correct.