The angle between the planes r . n1 = d1 and r . n2 = d2 is
A. cos θ ={|n1 | * |n2 |}/ (n1 . n2 )
B. cos θ = (n1 . n2 )/{|n1 | * |n2 |}2
C. cos θ = (n1 . n2 )/{|n1 | * |n2 |}
D. cos θ = (n1 . n2 )2 /{|n1 | * |n2 |}
Answer:C
The angle between the planes r . n1 = d1 and r . n2 = d2 is
A. cos θ ={|n1 | * |n2 |}/ (n1 . n2 ) B. cos θ = (n1 . n2 )/{|n1 | * |n2 |}2 C. cos θ = (n1 . n2 )/{|n1 | * |n2 |} D. cos θ = (n1 . n2 )2 /{|n1 | * |n2 |}