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Consider a point at the focal point of a convergent lens. Another convergent lens of short focal length is placed on the other side. What is the nature of the wavefronts emerging from the final image?
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Let us consider the figure shown below
Due to the converging lense $\mathrm{L}_1$ is at the focal point the point image formed $\mathrm{I}_1$ and due to the converging lense $\mathrm{L}_2$, the final image formed is I which is point image, so it behave like a point source of rays hence the wavefront for this image will be spherical symmetry.
Due to the converging lense $\mathrm{L}_1$ is at the focal point the point image formed $\mathrm{I}_1$ and due to the converging lense $\mathrm{L}_2$, the final image formed is I which is point image, so it behave like a point source of rays hence the wavefront for this image will be spherical symmetry.
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