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  4. 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 lens L is equal to the focal length of the lens. The correct direction of the emergent beam will be as shown in figure

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Q. 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 lens $L$ is equal to the focal length of the lens. The correct direction of the emergent beam will be as shown in figurePhysics Question Image

Ray Optics and Optical Instruments

Solution:

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