If a unit vector is represented by $0.5\hat i + 0.8\hat j + c\hat k$, then the value of ‘$c$’ is
If a unit vector is represented by $0.5\hat i + 0.8\hat j + c\hat k$, then the value of ‘$c$’ is
- [AIPMT 1999]
- A
$1$
- B
$\sqrt {0.11} $
- C
$\sqrt {0.01} $
- D
$\sqrt {0.39} $
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