What is the most important point of Huygen's wave theory ?
A plane wave passes through a convex lens. The geometrical shape of the wavefront that emerges is
A plane wavefront travelling in a straight line in vacuum encounters a medium of refractive index $\mu$. At $P,$ the shape of the wavefront is :
Write the limitation of Huygen's principle.
Explain refraction of plane wave with a thin prism.
Huygen's theory of secondary waves can be used of find