Let slope of incident ray be m.
∴ angle of incidence = angle of reflection
∴ ∣1+7mm−7∣=∣1−14−2−7∣=139
⇒1+7mm−7=139or1+7mm−7=−139
⇒13m−91=9+63m, or13m−91=−9−63m
⇒ m=−2 or m=3841
⇒y−1=3841(x−0)
⇒ 38y−38−41x=0
A ray of light is incident along a line which meets another line 7x−y+1=0 at the point (0,1). The ray is then reflected from this point along the line y+2x=1. Then the equation of the line of incidence of the ray of light is :
Held on 10 Apr 2016 · Verified 6 Jul 2026.
41x−25y+25=0
41x+25y−25=0
41x−38y+38=0
41x+38y−38=0
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