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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

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

 1910  231 Ray Optics and Optical Instruments Report Error

Solution:

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