on a hot summer night the refractive index of air is smallest near the ground and increases with hieght from the ground . when a light beam is directed horizontally the huygens principle leads to the conclusion tht1.bends upwards2.becomes narrower3.bends downwads4.goes horizontally without any deflection
on a hot summer night the refractive index of air is smallest near the ground and increases with hieght from the ground . when a light beam is directed horizontally the huygens principle leads to the conclusion tht
1.bends upwards
2.becomes narrower
3.bends downwads
4.goes horizontally without any deflection