Which of the following statements with regard to the phenomenon of the primary rainbow formation by water droplets is/are correct?
1. It involves refraction and one internal reflection of sunlight.
2. It involves refraction of sunlight only.
3. It is formed as the inner bow.
4. It may involve more than one internal reflection as well as refraction of sunlight.
Select the answer using the code given below:
1 only
1 and 3
3 and 4
2 and 3
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Which among the following events happened earliest ?
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An 80-litre solution of alcohol and water has 75% alcohol. How much water (in litres) must be added to bring down the concentration of alcohol to 60%?
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