^n1 is the unit vector along incident ray, ^n2 along the normal to plane mirror and ^n3 is the unit vector along reflected ray direction, then which of the following must be true?

^n1 is the unit vector along incident ray, ^n2 along the normal to pla

1.	^n1 is the unit vector along incident ray, ^n2 along the normal to plane mirror and ^n3 is the unit vector along reflected ray direction, then which of the following must be true?
Answer» $_{1}$ is the unit vector along incident ray, $_{2}$ along the normal to plane mirror and $_{3}$ is the unit vector along reflected ray direction, then which of the following must be true?

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^n1 is the unit vector along incident ray, ^n2 along the normal to plane mirror and ^n3 is the unit vector along reflected ray direction, then which of the following must be true?

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