A light ray emits from the origin making an angle 30° with the positive x-axis. After getting reflected by the line x+y=1, if this ray intersects…
JEE Main 2023 — Mathematics Coordinate Geometry
2023mcqmedium
A light ray emits from the origin making an angle 30∘ with the positive x-axis. After getting reflected by the line x+y=1, if this ray intersects x-axis at Q, then the abscissa of Q is
Official previous-year question
Held on 29 Jan 2023 · Verified 6 Jul 2026.
Options
A
(3−1)2
B
3+32
C
3−32
D
2(3+1)3
Did you get this right?
Sign in to track your attempts and accuracy.
Solution
On plotting the diagram of given data we get,
Let Q(h,0)
∵OP reflected by x+y=1
So, the image of Q lies on y=3x
∴1x−h=1y=2−2(h−1)
⇒x=1,y=1−h
Since it lies on y=3x
∴1−h=31
⇒h=1−31=33−1
On rationalising the numerator we get,
⇒h=33−1×3+13+1
⇒h=3+32
Your note
Sign in to keep a private note on this question. Nothing you write is ever public.