Consider a point at the focal point if a convergent lens another convergent lens of short final length is placed on the other side. What is the nature of the wave fronts
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Consider the ray diagram shown above...
The point image$I_{1 }$ due to L_{ 1 } is at the focal point. Now, due to the converging lens$L_{ 2}$, let the final image formed be I which is a point image, hence the wavefront for this image will be of spherical symmetry.
The point image$I_{1 }$ due to L_{ 1 } is at the focal point. Now, due to the converging lens$L_{ 2}$, let the final image formed be I which is a point image, hence the wavefront for this image will be of spherical symmetry.
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