A mirror and a source of light are situated at the origin \( O \) and at a point on \( O X \) ré...

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A mirror and a source of light are situated at the origin \( O \) and at a point on \( O X \) réspectively. A ray of light from the source strikes the mirror and is reflected. If the direction ratios of the normal to the plane are proportional to \( 1,-1,1 \), then direction cosines of the reflected ray are
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