Questions
A light ray emerging form the point source placed at P(2,3) is reflected at a point Q on the y-axis. It then passes through the point R(5,10). The coordinates of Q are
a
(1) (0,3)
b
(2) (0,2)
c
(3) (0,5)
d
(4) none of these
detailed solution
Correct option is C
The point of coincidence on the y-axis is Q(0,λ)The image of P(2,3) on the y-axis is P1(−2,3).P1,Q, and R are collinear.Therefore, Slope of P1,Q = slope of P1Ror λ−30−(−2)=10−35−(−2)or λ−3=2or λ=5Therefore, the point Q is (0,5)Talk to our academic expert!
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A ray of light along reflected on reaching x-axis the equation of the reflected ray is y = mx + c then
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