flat mirror lies in the X-Y plane. A light beam strikes the mirror with initial

Question

flat mirror lies in the X-Y plane. A light beam strikes the mirror with initial direction components X=+0.32, Y=+0.55, and Z=0.77. After reflection, the direction components will be
a)X=+0.55, Y=+0.32, and Z=+0.77.
b)X=+0.55, Y=+0.32, and Z=0.77.
c)X=0.32, Y=0.55, and Z=+0.77.
d)X=+0.32, Y=+0.55, and Z=+0.77.
e)X=0.32, Y=0.55, and Z=0.77.
A material's index of refraction n is given by
a)the speed of light in the vacuum times the speed in the material.
b)the speed of light in the material divided by the speed in the vacuum.
c)the frequency of light in the vacuum divided by the frequency in the material.
d)the speed of light in the vacuum divided by the speed in the material.

Explanation / Answer

Flat mirror lies in X-Y plane. so only z coordinate changes.

so after reflection

X = + 0.32, Y = +0.55, Z = +0.77

ANS (D)

----------------------------------------------------

index of refraction = the speed of light in the vacuum / the speed in the material.

Ans ( d)

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