A mirror and a source of light are situated at the origin O and at a point on OX (x-axis) respectively. A ray of light from the source strikes the mirror and is reflected. If the Drs of the normal to the plane are 1, –1, 1, then find d.c’s of the reflected ray.
Text Solution
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d.c’s of the reflected ray are 
Sol. Let the d.c’s of reflected ray be 
, then
d.r’s of the normal are 
∴ 
= 
= 
and so 2 + ( + 1) 2 + ( + 1) 2 = 1 i.e. = – 1 or – 
if = – 1, then d.c’s are 
which is not possible
∴ = – 
∴ d.c’s of the reflected ray are 
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