1.

A mirror and a source of light are situated at origin and a point on OX, respectively. A ray of light from the source strikes the mirror and reflected. If the direction ratios of the normal to the plane are 1,−1,1, then the direction cosines of the relected ray are

Answer»

A mirror and a source of light are situated at origin and a point on OX, respectively. A ray of light from the source strikes the mirror and reflected. If the direction ratios of the normal to the plane are 1,1,1, then the direction cosines of the relected ray are



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