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Question

Identify the incorrect statement regarding the reflection of light from a plane mirror when a light ray is incident obliquely. →R,→I and →N represents the vectors along the reflected ray, incident ray and normal direction.

A
R.(I×N)=0
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B
N.(I×R)=0
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C
I.(N×R)=0
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D
N×I=0
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Solution

The correct option is D N×I=0
Reflection of light from a plane mirror is shown in the figure.

We know that incident ray, reflected ray and normal all will lie in the same plane.
Therefore, I×N will be R. Thus,
R.(I×N)=0
Similarly, N.(I×R)=0 and I.(N×R)=0
As ray has been incident obliquely, therefore, 0<θ90.
So, N×I0
Hence, option (d) is correct.

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