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Direction: A plane mirror is a mirror with a flat reflective surface.
An incident ray is a ray of light that strikes a surface. The reflected ray corresponding to a given incident ray, is the ray that represents the light reflected by the surface. In figure, m and n are two plane mirrors perpendicular to each other.
Q. Incident ray CA is :
  • a)
    parallel to AB
  • b)
    perpendicular to BD
  • c)
    parallel to BD
  • d)
    perpendicular to AO
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Direction: A plane mirror is a mirror with a flat reflective surface....
Let normals at A and B meet at P.
As mirrors are perpendicular to each other, therefore, BP || OA and AP || OB.
So, BP ⊥ PA, i.e., ∠ BPA = 90°
Therefore, ∠ 3 + ∠ 2 = 90° (Angle sum property) (1)
Also, ∠1 = ∠2 and ∠4 = ∠3 (Angle of incidence = Angle of reflection)
Therefore, ∠1 + ∠4 = 90° [From (1)] (2) Adding (1) and (2), we have
∠1 + ∠2 + ∠3 + ∠4 = 180°
i.e., ∠CAB + ∠DBA = 180°
Hence, CA || BD
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Direction: A plane mirror is a mirror with a flat reflective surface....
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Direction: A plane mirror is a mirror with a flat reflective surface.An incident ray is a ray of light that strikes a surface. The reflected ray corresponding to a given incident ray, is the ray that represents the light reflected by the surface. In figure, m and n are two plane mirrors perpendicular to each other.Q. Incident ray CA is :a)parallel to ABb)perpendicular to BDc)parallel to BDd)perpendicular to AOCorrect answer is option 'C'. Can you explain this answer?
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