Q 2135167962.     A mirror and a source of light are situated at the origin `O`
and a point on `OX` respectively. A ray of light from the
source strikes the mirror and is reflected. If the DRs of the
normal to the plane of mirror are `1, - 1, 1`, then DCs for the
reflected ray are

A

`1/3,2/3,2/3`

B

`-1/3,2/3,2/3`

C

`-1/3,-2/3,-2/3`

D

`-1/3, -2/3,2/3`

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