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

What is the shape of the wavefront in each of the following cases: The portion of the wavefront of light from a distant star intercepted by the Earth.

What is the shape of the wavefront in each of the following cases:Light diverging from a point source.

What is the shape of the wavefront in each of the following cases: Light emerging out of a convex lens when a point source is placed at its focus.

What is the shape of chromate ion ?

What is the shape of chromate ion ?

What is meant by a wavefront?What is the shape of the wavefront of a beam of parallel rays?

What is the shape of mitochondria?