What is the geomatrical shape of the wavefront when a plane wave passes through a convex lens ?

What is the geometrical shape of the wavefront when a plane passes through a convex lens?

What is the geometrical shape of a wave front when a plane wave passes through glass prism.

A : The geometrical shape of the wave front when a wavefront passes through a convex lens will be again plane wave front R : Whne a plane wave front is reflected by a concave mirror, it remains as plane wavefront.

What is the shape of the wavefront on earth for sunlight?

What is the shape of the wavefront on earth for sunlight?