Reason (R): All parallel rays of monochromatic light passing through a convex lens do not come to a focus at the same point.
Solution:
A single convex lens suffers from chromatic aberration due to dispersion, so (A) is true. For monochromatic light, ideal parallel rays passing through a convex lens *do* converge at a single focal point (ignoring spherical aberration). Hence, (R) is false.
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