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A ray of light is incident on a plane mirror at an angle of 40° with respect to a surface normal. When it gets reflected from the mirror it undergoes a deviation of
  • a)
    40°
  • b)
    100°
  • c)
    90°
  • d)
    80°
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A ray of light is incident on a plane mirror at an angle of 40° wi...
Angle of deviation: It is the angle made by the reflected ray and the original path of the incident ray (as shown in the diagram)

 
Angle of Deviation (δ)  = 180° - [ i + r ]  or  180°- 2i (as i=r) 
= 180°- [ 40° + 40°]
= 100°
Therefore, a ray of light will undergo a deviation of 100°
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Most Upvoted Answer
A ray of light is incident on a plane mirror at an angle of 40° wi...
Degrees to the normal. What is the angle of reflection?

The angle of reflection is also 40 degrees, as the angle of incidence and angle of reflection are always equal for a plane mirror.
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A ray of light is incident on a plane mirror at an angle of 40° with respect to a surface normal. When it gets reflected from the mirror it undergoes a deviation ofa)40°b)100°c)90°d)80°Correct answer is option 'B'. Can you explain this answer?
Question Description
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