Wavefront means
All particles in it have same phase
All particles have opposite phase of vibrations
Few particles are in same phase, rest are in opposite phase
None of these
The wave theory of light was given by
According to corpuscular theory of light, the different colours of light are due to
Explain the refraction of a plane wavefront with a thin convex mirror.
In the adjoining diagram, a wavefront $AB$, moving in air is incident on a plane glass surface $XY$. Its position $CD$ after refraction through a glass slab is shown also along with the normals drawn at $A$ and $D$. The refractive index of glass with respect to air ($\mu = 1$) will be equal to
Explain the use of wavefront to understand wave propagation.