If a unit vector is represented by \( 0.5 \hat{i}+0.8 \hat{j}+c \hat{k} \), then the value of ' ... VIDEO
If a unit vector is represented by \( 0.5 \hat{i}+0.8 \hat{j}+c \hat{k} \), then the value of ' \( c \) ' is
[EAMCET 1994; CBSE PMT 1999]
(a) 1
(b) \( \sqrt{0.11} \)
(c) \( \sqrt{0.01} \)
(d) \( \sqrt{0.39} \)
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