With reference to Mirage, which among the following statements is / are correct?
1.The refractive index of hot air is greater than cold air
2.When light rays pass from hotter to cooler layers of air, they curve downward
3.The phenomenon of Superior mirage is most commonly found in polar regions
Choose the correct option from the codes given below:

Answer: [B] Only 2 & 3

This question is a part of GKToday's Integrated IAS General Studies Module