Question

The wave front due to a point source at a finite distance from the source is -
a)spherical b)cylindrical
c)plane d)circular

Answer 1

Correct Option is A: Spherical

Reason :

A wave front is the locus of all the particles vibrating in same

phase.

When wave front is a point source then wave front is spherical

eave front travels in the forward direction of medium.

Light ray travel normal to wave front.

Answer 2

$\bf{wavefront}$ : Each point source of light is a centre of disturbance from which waves spread in all directions. The locus of all the particles of the medium vibrating in the same phase at a given instant is called a wavefront.

you should know that, wave front due to a point source at a $\bf{finite}$ distance from the source is $\bf{spherical}$ as shown in figure.