Question

What is the shape of the wavefront of light emitted by a long neon bulb placed at a finite distance?

Answer 1

Answer: Plane

Explanation:

Answer 2

Answer:

The cylindrical wavefront of light will be emitted by a long neon bulb placed at a finite distance.

Explanation:

The shape of the wavefront depends on the source of light.

Here in this question, the source of light is linear in shape as the bulb is long. And when the source of light is linear in shape then the locus of all the points which are equidistant from the linear source lies on a cylinder and the wavefront formed is called cylindrical wavefront.

Hence, the cylindrical wavefront of light will be emitted by a long neon bulb placed at a finite distance.