If a ray travelling in the direction 1 2 i ^ + 3 j ^ is incident on a plane mirror, after reflection, the ray travels along the direction 1 2 i ^ - 3 j ^ . The angle of incidence is

Question

If a ray travelling in the direction 1 2 i ^ + 3 j ^ is incident on a plane mirror, after reflection, the ray travels along the direction 1 2 i ^ - 3 j ^ . The angle of incidence is, 45 o, 75 o, 30 o, 60 o

MARKS App · Accepted Answer

Angle between incident ray and reflected ray cos ⁡ δ = i ^ + 3 j ^ . i ^ - 3 j ^ 2.2 cos ⁡ δ = - 1 2 ⇒ δ = 120 o 180 - ∠ i = 120 ⇒ ∠ i = 60 o

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