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  • Consider a point at the focal point of a convergent lens Another convergent lens of the short focal length is placed on the other side What is the nature of the wavefronts emerging from the final image

Consider a point at the focal point of a convergent lens. Another convergent lens of the 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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Explanation:-

When a point object is placed at the focal point of a converging lens, the resulting light rays emerging from the lens are parallel. This is a key property of lenses — when a point object is placed at the focal point, the rays are refracted parallel to the optical axis, forming a plane wavefront.

The light rays emerging from the first lens, after being refracted from the point at the focal point, are parallel.

Here the orientation of the rays is perpendicular to L1. It forms an image at I1, i.e. the focal length. Again, the image is converged and goes through L2 after which the final image is formed at I. The nature of the wavefronts emerging from the final image is Spherical.

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Gurleen Kaur

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