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A man starts from the point P(-3,4) and ...

A man starts from the point `P(-3,4)` and reaches the point `Q(0,1)` touching the x-axis at `R(alpha,0)` such that `PR+RQ` is minimum. Then `alpha` and `|alpha|`.

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The correct Answer is:
0.6
For PR=RQ to be minimum,it should be the path of light.

`therefore anglePRA=angleQRM`
From similar triangles PAR and QMR.
`(AR)/(RM)=(PA)/(QM)`
or `(alpha+3)/(0-alpha)=(4)/(1)or alpha=-(3)/(5)`
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