A mirror and a source of light are situated at the origin 
and at a point on 
respectively. 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 
, then direction cosines of the reflected ray are
a)
b)
c)
d)
A mirror and a source of light are situated at the origin and at a point on respectively. 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 , then direction cosines of the reflected ray are
a)
b)
c)
d)
Question ID - 56101 | SaraNextGen Top Answer
A mirror and a source of light are situated at the origin and at a point on respectively. 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 , then direction cosines of the reflected ray are
a)
b)
c)
d)
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A mirror and a source of light are situated at the origin |
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a) |
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b) |
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c) |
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d) |
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(d)
Let the source of light be situated at 
, where, 
Let 
be the incident ray, 
be the reflected ray and 
be the normal to the mirror at 
Direction ratios of 
are proportional to 
and so its direction cosines are 1, 0, 0
Direction cosines of 
are 
.png)
Let 
be the direction cosines of the reflected ray 
. Then,
Hence, direction cosines of the reflected ray are 