1.

A mirror and source of light are kept at the origin and at a point on the positive x-axis respectively. A ray of light from the sources strikes the mirror and is reflected. If (1,-1,1) are the d.r's of a normal to the plane, then the d.c's of the reflected ray are:

Answer»

`((-1)/(3), (-2)/(3), (2)/(3))`
`((1)/(3), (2)/(3), (2)/(3))`
`((1)/(3), (-2)/(3), (2)/(3))`
`(-(1)/(SQRT(3)), (-1)/(sqrt(3)), (1)/(sqrt(3)))`

ANSWER :A


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