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  • A light ray emerging from the point source placed at P(2, 3) is reflected at a point ‘Q’ on the y-axis and then passes through the point R(5, 10). Coordinate of ‘Q’ is -

A light ray emerging from the point source placed at P(2, 3) is reflected at a point ‘Q’ on the y-axis and then passes through the point R(5, 10). Coordinate of ‘Q’ is -

Option: 1

(0, 3)


Option: 2

(0, 2)


Option: 3

(0, 5)


Option: 4

none of these


Answers (1)

best_answer

If P_1 be the reflection of P in y-axis then P_1 \equiv (– 2, 3) 

Equation of line \mathrm{P}_1 \mathrm{R} is
(y-3)=\frac{10-3}{5+2}(x+2)
\Rightarrow \quad y=x+5  It meets y-axis at (0,5) \Rightarrow Q \equiv(0,5)

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shivangi.bhatnagar

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