Question

observe the diagram and answer the question: when the earth is at A where will the sub appear to an observer on the earth​

Answer 1

Answer: The light is emitted in all directions of 3-dimensional space with the same intensity by the Sun. By considering the Sun as a single emitting point in space we can say that the wavefront of the emitted light will be a sphere centered on the Sun.

Answer 2

The earth is emitted in all directions of 3dimonsianal space with the same intensity by the sun.By considering the sun as a single emitting point in space we can say that the wave front of the emitted light will be a sphere centred on the sun