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 wave fronts emerging from the final image?

Question

Philoid · Accepted Answer

Consider a point right to Convergent Lens having a focal length equal to F1, since ray is emerging from its focal length therefore after passing through it, it will become parallel to each other. And these rays after passing through a convergent lens having Focal Length F2 will converge. And this point will act as point source which will propagate equally in every direction and thus generating a spherical wavefront