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?
Hint: The converging lens forms converging wavefronts.
Consider the ray diagram shown below.
The point image l, due to L, is at the focal point. Now, due to the converging lense L, let final image formed is l which is a point image, hence the wavefront for this image will be of spherical symmetry.
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