The slit of a collimator is illuminated ...

The slit of a collimator is illuminated by a source as shown in the adjoining figures. The distance between the slit `S` and the collimating lengs `L` is equal to the focal length of the lens. The correct direction of the emergent beam will be as shown in figure.

None of the figures.

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The correct Answer is:

In case of convex lens if rays are coming from the focus, then the emergent rays after refraction are parallel to principal axis.

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