A plane wave is incident on a concave mirror of radius R. The shape of the reflected wavefront will be

converging spherical

The correct answer is Option (3) → converging spherical

For a concave mirror:

• A plane wave incident on a concave mirror converges after reflection.
• The reflected wavefront becomes spherical and converging, with the center of curvature at the focal point of the mirror.

Answer: Reflected wavefront is spherical and converging