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A light ray emerging from the point source placed at P (1,3) is reflected at a point Q in the axis of x . If the reflected ray passes through the point R(6,7) , then the abscissa of Q is:

Options

  1. A1
  2. B3
  3. C7 2
  4. D5 2

Correct answer

D. 5 2

Step-by-step solution

Let abcissa of Q =x aligned & Q=(x, 0) & = 0-7 x-6 , (180^ - )= 0-3 x-1 aligned Now, (180^ - )=- -3 x-1 = -7 x-6 x= 5 2

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