Question

A wavefront at t= t sec is generated by taking the envelope of secondary wavelets from ___________ points on the wavefront at t=0 sec.

• A. few
• B. all
• C. one
• D. none

Answer 1

The correct option is B all

Hey, remember the principle, all the points on a wavefront act like as sources and produce secondary wavelets, the envelope of which gives the new wavefront.
p.s: wavelet is just a small wave, secondary wavelets are just waves which the points are hypothesised to create.