Carefully analyses the diagram and choose the correct option :
$i$ and $ii$ are true
$i$ and $iii$ are true
$i$ and $iv$ are true
$ii$ and $ii$ are true
Figure, shows wave fronts in still water moving in the direction of the arrow towards the interface $PQ$ between a shallow region and a deep(denser) region. Which of the lines shown may represent one of the wave fronts in the deep region?
Explain the reflection of plane wavefront from concave mirror.
The idea of secondary wavelets for the propagation of a wave was first given by
On a hot summer night, the refractive index of air is smallest near the ground and increases with height from the ground. When a light beam is directed horizontally, the Huygens' principle leads us to conclude that as it travels, the light beam