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?
(SPHERICAL) The final image is a point-like source formed at position $I$ on the common principal axis of both lenses.
Since this point acts as a secondary source,it emits spherical waves in all directions.
According to Huygens' principle,the wavefront at any instant is the envelope of these secondary spherical wavelets.
As the light rays converge towards the point $I$,the wavefronts emerging from the final image are spherical in nature,converging towards the point $I$.
Since this point acts as a secondary source,it emits spherical waves in all directions.
According to Huygens' principle,the wavefront at any instant is the envelope of these secondary spherical wavelets.
As the light rays converge towards the point $I$,the wavefronts emerging from the final image are spherical in nature,converging towards the point $I$.
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