A parallel beam of rays is incident on a convergent lens with a focal length of 40cm. Where. should a divergent lens with a focal length of 15 cm be placed for the beam of rays to remain
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Consider if the mirror was absent and the lens is operating in the symmetrical model.
The focal length = 20 cm and the image arises on the other side of the lens.
The image now becomes a new source if we are going to reflect the object back to the original position. The beam of rays remains constant.
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