Two converging lenses are to be placed in the path of parallel rays so that the
rays remain parallel after passing through both lenses. How should the lenses be arranged ? Explain with a neat ray diagram.
i) A parallel beam of light rays will converge on focal point of the lens after refraction.
ii) Light rays passes through the focal point will parallel to principal axis after re-fraction.
iii) So the two lenses are arranged ’ on a common principal axis such that their focal points coincide with each other, then the rays remain parallel after passing through both lenses.
