Newton postulated his corpuscular theory on the basis of

Select the correct option regarding the history and nature of light.

$A$ wave front is the locus of all the points where the particles of the medium vibrate with the same:

Given below are two statements:
Statement-$I$: $A$ plane wave after passing through a prism remains a plane wave, but passing through a small pinhole may become a spherical wave.
Statement-$II$: The curvature of a spherical wave emerging from a slit will increase for increasing slit width.
In the light of the above statements, choose the correct answer from the options given below.

By Huygen's wave theory of light,we cannot explain the phenomenon of

State and explain Huygens' principle.