NCERT Exercise 10.3 Q18 - Vector Algebra
Question: If a is a nonzero vector of magnitude a and lambda a nonzero scalar, then lambda a is a unit vector if (A) lambda=1 (B) lambda=-1 (C) a=|lambda| (D) a=1/|lambda|.
Answer: (D).
Full step-by-step NCERT solution with diagrams on Something by Zero.