A ray of light along x + 3 y = 3 gets reflected upon reaching X - axis, the equation of the reflected ray is

A ray of light along x+3y=3 gets reflected upon reaching X-axis, the equation of the reflected ray is
  1. y=3x-3
  2. 3y=x-1
  3. y=x+3
  4. 3y=x-3

Solution

Let incident ray intersecting Y-axis at B and X-axis at A.

∆OAB is congruent to ∆OAB'

Hence OB'=OB

Equation of B'A:x3+y-1=1

or  x-3y=3.

Asked in: JEE Main 2013 (07 Apr)

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