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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 ima

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?

Option: 1

Spherical        


Option: 2

Plane


Option: 3

Cylindrical


Option: 4

None of the above


Answers (1)

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Orientation of wave front is perpendicular to ray. The ray diagram of the situation is as shown in figure:

Parellel rays incident on lens L_{1} forms the image I_{1} at the focal point of the lens. This image acts as object for the lens L_{2}. Now, due to the converging lens L_{2}. let final image formed is I which is point image. Hence the wavefront for this image will be of spherical symmetry.

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Divya Prakash Singh

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