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Consider the planes vecr.vecn1=d1 and ve...

Consider the planes `vecr.vecn_1=d_1 and vecr.vecn_2=d_2` then (A) they are perpendiculat if `vecn_1.vecn_2=0` (B) intersect in a line parallel to `vecn_1xxvecn_2 if vecn_1` is not parallel to `vecn_2` (C) angle between them is `cos^-1((vecn_1.n_2.)/(|vecn_1||vecn_2|))` (D) none of these

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