Huygen’s principle of secondary wavelets may be used to
Find the velocity of light in vacuum
Explain the particle behaviour of light
Find the new position of the wavefront
Explain photoelectric effect
Explain the use of wavefront to understand wave propagation.
Wavefront of a wave has direction with wave motion
Ray diverging from a point source from a wave front that is
The wave theory of light was given by
In the adjacent diagram,$ CP$ represents a wavefront and $AO$ & $BP$, the corresponding two rays. Find the condition on $\theta$ for constructive interference at $P$ between the ray $BP$ and reflected ray $OP$