Light wave travel in vacuum along the $x$-axis, which of the-following may represent the wave front
$x=a$
$y=a$
$z=a$
$x+y+z=a$
Explain the reflection of a plane wave using Huygen's principle.
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
What is visible light ? Write various view on it.
Huygens' concepts of secondary wavelets
Wavefront means